The Sacristy of the Virgin of the Basílica del Pilar: Breviary of Marian Apology

Abstract

This article analyses the iconographic cycle of the Sacristy of the Virgin in the Basílica del Pilar, with the aim of unveiling the complex system of visual symbols present in its bas-reliefs. Through a typological and exegetical approach, the study examines the various Marian representations, highlighting their connection with Old Testament, Patristic, Scholastic, and Baroque traditions. The research demonstrates how these visual emblems embody the principles of Divine Motherhood, purity, Co-Redemptrix, and the Virgin’s spiritual superiority. Furthermore, it explores the relationship between the carvings and hermeneutic and emblematic literature, revealing how tradition and devotion intertwine to configure a genuine Baroque iconographic breviary. The findings allow for an interpretation of Mary not only as an object of worship but also as a theological paradigm and aesthetic model of divine perfection, thus offering a comprehensive vision of Baroque Mariology and of the didactic and devotional function of the Sacristy of the Virgin.

1. Introduction

The Sacristy of the Virgin of the Basílica de Nuestra Señora del Pilar in Zaragoza, despite its evident artistic and patrimonial significance, has received scant attention from the scholarly community, particularly concerning its iconographic and iconological program, in contrast to the numerous architectural studies.1 Yet it stands as a Baroque jewel, constructed between 1755 and 1760. Documents preserved in the Capitular Archive of the Pilar2 indicate that in 1753 the former Sacristy of the Holy Chapel was demolished to make way for a new structure that would more fittingly reflect the decorum appropriate to the future tabernacle. Construction proceeded with remarkable speed and without impediments, enabling, in 1756, the ornamentation of the “façade”,3 and a year later, the interior decoration of the room, where the sculptor José Ramírez executed the stucco work of the “sculpture” and carved the “bas-reliefs of the Sacristy Doors worked on both sides, and those of the Jewelry Cabinet and Silver Cabinet: And the four of the Oratory, Holy Water Stoup, Spiral Staircase, Wax Disposal Room [“Retrete” de la Cera]”,4 in accordance with the designs of the Royal Architect Ventura Rodríguez5 (Figure 1a,b).

The present study seeks to offer an iconological exegesis of the symbolic trajectory of the emblems that structure the sculptural discourse of the Sacristy of the Virgin, drawing upon the hermeneutics of primary sources and emblematic treatiography6 from the sixteenth to the eighteenth centuries, with particular attention to the treatise Flores de Miraflores, hieroglificos sagrados, verdades figuradas, sombras verdaderas del mysterio de la Inmaculada Concepción de la Virgen y Madre de Dios María Señora nuestra7 by Fray Nicolás de la Iglesia.8

Finally, it should be emphasised that, despite the lavish ornamental programme and the richness of allegorical detail that permeate the walls of the Sacristy of the Virgin,9 this study is confined exclusively to the Marian repertoire, whose intricate iconographic program alone warrants close scholarly attention. The examination follows a sequential path, beginning at the entrance door, continuing along the cabinet doors and the four wall panels,10 passing through the eight cartouches, and culminating in the gilded medallions (Figure 2 and Figure 3).

2. The Marian Apologetic Exegesis of the Sculptural Ensemble of the Sacristy of the Virgin of the Basílica del Pilar

At the beginning of the itinerary, the monumental entrance door stands as the first point of attention for the viewer upon approaching the Sacristy of the Virgin (Figure 3, no. 1). Its two leaves, richly worked on both faces, display a set of bas-reliefs of exquisite execution.11 Each is organized into three mixed-line panels: the upper and lower, identical on both sides, and a larger central coffer, distinct on each leaf, which concentrates the iconological core of the program. Accordingly, the upper panels exhibit tondos with cherubic heads (Figure 4), while the lower contain a bouquet of lilies and crossed palms inscribed within a royal crown (Figure 5a). This emblematic arrangement unequivocally alludes to the regal dignity of the Virgin Mary as Queen of Heaven, a title conferred upon her by virtue of her triumph over sin and her eminent status as Mother of the Redeemer of humankind.

The lily, or lilium convallium (lily of the valley), draws its roots from the Song of Songs12, from which it was soon incorporated into the Christian imagination as an emblem of Marian virtue. Its figure thus becomes a metaphor for perpetual purity, especially prominent in the Renaissance and Baroque as the quintessential attribute of Mary’s virginity. John of Damascus (675–749) already elaborated an encomiastic allegory around the “lily among thorns,” exalting the singular purity of the Virgin in contrast to the “sinful people of the Jews”,13 and presenting her as the new Eve, superior to the rest of the holy virgins.14 This early reflection established an interpretative thread incorporating new semiotic and theological dimensions: Fulbert of Chartres (ca. 960–1028)15 and Bonaventure (ca. 1221–1274)16 took up and expanded the reflections of their predecessor, while Peter Damian (ca. 1007–1072) added the correlation with the dogmas of Divine Motherhood and the Incarnation of Christ.17

Over time, the lily transcended the strictly theological realm to become integrated into emblematic literature. Juan de Horozco y Covarrubias (ca. 1545–1610) addressed this motif in his book Sacra Symbola,18 from a rigorously scholastic perspective: “like the lily […] among thorns and without the sting of sin”.19 In this way, the graphic and literary reinterpretation of the lily establishes a continuous dialogue between patristic thought and the emblematic tradition of the sixteenth century (Figure 5b).

The next element, the palm branch, follows a trajectory as an attribute analogous to that of the laurel or olive (to be examined later). Conceived in the classical world as an emblem of victory,20 it underwent a profound symbolic transformation with the advent of Christianity. In this new framework, its allegorical value shifts towards a spiritual dimension, expressing triumph within the moral confrontation of good against evil, based on the reinterpretation of the miracle of the palm in the Flight into Egypt from the Apocryphal Gospel of Pseudo-Matthew.21

Furthermore, when applied specifically to the Marian sphere, it acquires an additional level of complexity, combining passages from the Song of Songs22 and Ecclesiasticus23 in an exegesis that fuses them into a single discourse, portraying the Marian existence as an uninterrupted victory, from her Immaculate origin to her glorious consummation, as Fr Nicolás de la Iglesia had already clarified.24 Indeed, through the first book, the friar alludes to the progressive revelation of the mystery of her Immaculate Conception, the principle of her victory, while with Ecclesiasticus, he encompasses the fullness of a virtuous life up to her Dormition.25

Next, in the central panels, each front displays its own discourse, so that a distinction can be made between the exterior (facing the room’s façade) and the interior (oriented towards the interior of the Sacristy of the Virgin). As Belén Boloqui notes, the bas-reliefs on the door leaves of the external face point to the “dignity” of “Archbishop Francisco de Añoa y Busto”.26 While we concur with the researcher’s view, since it is evident that the family coat of arms and the archiepiscopal miter are represented, we consider that these reliefs transcend this mere distinction. Indeed, the composition is closely linked to the function of the room, anticipating the viewer with the liturgical and devotional objects it houses within. However, this issue is considered tangential within the framework of the present study, as the primary interest lies in the palms of victory, the lilies of purity, and the olive branches, which, although at first glance might be interpreted as mere decorative motifs, in fact constitute first-order Marian emblems (Figure 6).

Having previously analyzed the lilies and the palms in the quarter panel, this section will focus on the olive branch. As noted, the iconological trajectory of this plant reflects a development parallel to that of the palm.27 From a Marian perspective, the olive branch embodies Mary’s triumph over the sin of corruption and her immeasurable mercy. The origin of this motif can be traced to the passage in Ecclesiasticus: “[…] as a fine olive in the plain […]”.28 It was during the Middle Ages, however, that the biblical reference was transformed into a Marian emblem. In this context, Abbot Absalon († ca. 1196) carried out a theological reinterpretation that elevated the olive branch from Ecclesiasticus to the status of an attribute of the triumph of Mary’s virginal purity,29 establishing the first iconological foundations. A century later, Antoninus of Florence (1389–1459), in continuity with his predecessor, expanded the iconological horizon of this metaphor to incorporate the Marian virtue of mercy through an analogy with the olive fruit. According to the saint, the olive embodies mercy, for from its fruit is obtained the oil.30

Simultaneously, the interior faces display the same bas-reliefs on both sides. Following the vertical arrangement: at the upper level, there is a ribbon motif from which hang two crossed palms of victory, and beneath them, an oval tondo with a radiant star, emitting light and iconographic centrality. The composition is finally crowned by a cherubic head with outstretched wings, accompanied by garlands (Figure 7a).

The star within the clipeus represents Mary as the “Star of the Sea”, in accordance with the eleventh hieroglyph in the Flores de Miraflores (De la Iglesia 1659) (Figure 7b). It should be noted that its origin predates this work, as the emblem derives from the medieval hymn Ave maris Stella, interpreted within the framework of the Liturgy of the Hours. Its authorship is unknown, though it has been variously ascribed to such figures as Venantius of Poitiers (540–600), Paul the Deacon (ca. 720–ca. 799), Bernard of Clairvaux (1090–1153), or even King Robert II of France (972–1031). Nevertheless, it has been impossible to confirm its authorship, as 8th-century codices already record this hymn.

From its earliest formulations, the image of Mary as Star of the Sea manifests a multidimensional character: her superiority over other terrestrial and celestial creatures, her capacity for aid and intercession as Co-Redemptrix,31 and her perpetual virginity (the latter two precepts are often linked). In this way, Bernard of Clairvaux, in his second homily in praise of Mary, already explored these three facets, consolidating the roots of her qualities of preeminence.32 A few decades later, Abbot Absalon († ca. 1196) revisited and expanded upon the Marian principles indicated by Bernard of Clairvaux, employing a triple metaphor to reaffirm Mary’s predominance over the female gender in general and over the holy virgins in particular,33 as well as the concept of guidance, incorporating the notion of a “safe harbor”.34 In this same line, we find Peter of Celle (1115–1183)35 and Bonaventure (ca. 1221–1274),36 who ultimately defined the idea of Mary as a beacon of moral rectitude. Finally, in 1659, Nicolás de la Iglesia established the nominal and symbolic equivalence of Mary as Star of the Sea, confirming her role as a guide and solace for sinners.37

Moving on to the cabinets (Figure 3, nos. 2–3), the arrangement of the bas-reliefs follows the same scheme as the entrance door (Figure 8a,b). Both the upper and lower quarter panels display identical decoration with cherubic heads, while the lower body is adorned with ribbon motifs, shared by both pieces of furniture.38 As with the door leading into the room, the reliefs on the central sections anticipate the function of the cabinets: the Jewelry Cabinet of the Virgin housed crowns and treasures donated by the faithful, whereas the Silver Cabinet safeguarded liturgical objects.39 With regard to the subject under consideration here, the Marian iconography once again focuses on subtle ornamental motifs—lilies of purity, palms, and olive branches of victory—and introduces a new element: the laurel, represented through the laureole in the Jewelry Cabinet.

This plant, in consonance with the palm and the olive, has stood since Antiquity as an emblem of triumph. Ovid (43 B.C.–17 A.D.), in recounting the myth of Apollo and Daphne,40 consecrated it to the glory of victors, transforming the god’s unattainable love into an eternal tribute.41 A century later, this mythic legacy found affirmation in the earthly realm through the rational and naturalistic discourse of Pliny the Elder (ca. 23–79) who extolled the strength and incorruptibility of the laurel, asserting that it could not be “touched by lightning” nor by “fire” (Pliny the Elder 2010b, pp. 333, 336–37). Thus, human glory became associated with an inviolable nature, endowing the motif with a quality of permanence beyond the contingencies of triumph. With the advent of Christianity, the significance of the laurel was not extinguished but reinterpreted in a spiritual key. The earthly victory of heroes was transformed into a victory over sin and vice while Pliny’s notion of incorruptibility came to signify the perpetuity of virtue. In this respect, Cesare Ripa (ca. 1555–1622) incorporated it into his Iconologia as an attribute of the Academy, Unsurpassable Virtue, and Victory (Ripa 1625, pp. 4, 722, 729), thereby confirming the enduring nature of an emblem that, from pagan myth to Christian allegory, retained its triumphal essence intact.

Continuing through this allegorical Marian breviary, we now turn our attention to the four wall panels.42 Upon entering the Sacristy of the Virgin, one encounters on the east wall the first of the doors under study: the access door to the Wax Disposal Room (“Retrete” de la Cera) (Figure 3, no. 4). Regarding its decoration, the medallion reveals a complex relief composed of a cypress at the center, flanked by a rose bush to the left and a pair of lilies of purity to the right (from the viewer’s perspective) (Figure 9a). The combined analysis of this iconographic triad attests to the purity of Mary in her three states: before, during, and after childbirth. Within this framework, the rose refers to the Immaculate Conception of Mary,43 corresponding to the “mysterious rose.” Its symbolic genesis is already present in the Book of Sirach, which alludes to “[…] as the rose bushes of Jericho”,44 facilitating its early Marian reinterpretation. From its earliest formulations, the image of Mary as this flower served to demonstrate her sanctity vis-à-vis original sin, a notion further developed by John of Damascus (675–749).45 Over the centuries, this initial exegesis was nuanced and expanded by authors such as Anselm of Canterbury (1033–1109)46 or Peter of Celle (1115–1183),47 thereby consolidating a first line of interpretation centered on the immaculate holiness of the Virgin. Later, in the 13th century, the tradition was expanded by Bonaventure (1218–1274)48 and Albert the Great (ca. 1193/1206–1280),49 focusing on the defense of Mary’s virginity and her excellence over all other beings. This interpretative current extended into the work of Alanus Varenius, a French musician of the 15th–16th centuries, who nicknamed her the “rosa sine spina (roses without thorns)” (Alanus Varenius 1648, vol. 3, p. 508). Finally, in 1659, Fr Nicolás de la Iglesia consolidated centuries of apologetic theory by explicitly associating the rose with Mary’s immaculate virtue, under the interpretation of his hieroglyph of the “mysterious rose”50 (Figure 9b).

The next element, the lily, highlights Mary’s purity during childbirth, rooted in the Gothic tradition as an indispensable attribute of the iconographic cycle of the Annunciation.51 Finally, the cypress revisits the principle of Marian incorruptibility, addressing it comprehensively through her three states (before, during, and after). Since classical Rome, the cypress has been associated with preservation, as well as with the god Pluto and with death. This belief has its roots in the classical myth of Cyparissus,52 where the funerary function of the shrub is first noted due to its unalterable nature. Just over a century later, Pliny the Elder (ca. 23–79) transferred this quality from the mythic sphere to the domain of natural observation, emphasizing the resistance of its wood to decay (Pliny the Elder 2010c, p. 423; Pliny the Elder 2010d, p. 465). However, this interpretation did not emerge in isolation: several centuries earlier, the Song of Songs53 had already employed this same property to praise the purity of the beloved through the metaphor of a closed garden or orchard.54 In subsequent centuries, medieval theologians integrated the mythological and naturalistic dimensions, as well as the biblical tradition, to consolidate the cypress as a Marian attribute. Consequently, Anselm of Canterbury (1033–1109) merely referred to the Virgin “cypressus in monte Sion” (cypress on Mount Zion) (Anselmi Cantuariensis 1864b, p. 962. Cited in Salvador González 2014, p. 23), while Albert the Great (ca. 1193/1206–1280) and Rupert of Deutz (1070–ca. 1129) returned to the semiotic origins of the motif to evoke her state of chastity through two elements: the former from a classical perspective, emphasizing the “white seeds” of “chastity”,55 and the latter from a biblical inspiration with the “closed garden” and the trees it contains.56 Once the Marian emblem was defined, modern authors tended to repeat what had been established by their predecessors, such as Joseph de Jesús María (1562–1629), who emphasized the gift of preservation against the “corruption” of Roman origin.57 By contrast, Alonso Bonilla58 offers a decisive reinterpretation of the cypress, linking its incorruptibility not only to the virtue of preservation but also to Mary’s auxiliary role as Co-Redemptrix, evoked through the iconography of the Virgin of Mercy.59

Continuing along the east wall, above the door that formerly communicated with the oratory (now the sacristan’s office) (Figure 3, no. 5), we find a bas-relief depicting Mary as the “sun rising into the world,” whose first morning rays illuminate a pair of sunflowers60 that, in a gesture of natural devotion, incline their corollas towards sunrise (Figure 10a). This motif has its roots in the Song of Songs,61 which facilitated its early reception and integration into Marian religious treatises. In this regard, Chrysippus of Jerusalem (315–386) introduces one of the earliest approaches to the emblem, establishing through the formula: “Ave Solis, qui nullum ferre potest occasum” the correspondence between the eternal sun and the unchanging virtue of the Virgin (Chrysippus Hierosolymitanus 1677, vol. 11, p. 1044). During the early centuries of the Middle Ages, the values of perpetual purity highlighted by Chrysippus were maintained, although some authors, such as John of Damascus (675–749), incorporated further exegetical expansions. In particular, he composed a proportional simile between Mary’s everlasting dignity and the radiant whiteness of the sun, so that the Virgin’s infinite integrity was not only confirmed by analogy with the permanence of the imperishable sun, but also manifested in the immaculate brilliance of her light.62 Over the following centuries, the Marian metaphor continued to develop: Bonaventure (1218–1274), for instance, recognized in Mary not only the virtue of purity but also the radiance of all glory, creating a model of moral and spiritual perfection that transcends mere virtue.63 Others, such as Albert the Great (ca. 1193/1206–1280), simply conferred upon her an epithet: “ipsa est sol, qui sua praesentia ornat caelum (she herself is the sun, which with her presence adorns the heavens)” (Albertus Magnus 1651, vol. 20, p. 20). What is particularly noteworthy about this designation is that it departs from the verse in the Song of Songs and refers instead to the Ecclesiasticus.64 Finally, the symbolic evolution reaches its culmination in the eighth hieroglyph of Fr Nicolás de la Iglesia65 (Figure 10b), where the author synthesizes these doctrinal traditions into a visual materialization grounded in verses 20 and 21 of chapter 26 of the Ecclesiasticus.66

Corresponding to the two previously examined carvings, the western wall features another set of doors, equally adorned with refined bas-reliefs. The first opens onto the hall of the Holy Water Stoup (Figure 3, no. 6). The scene depicts Mary under the invocations of the “well of living waters” and the “sealed fountain,” through the image of a sumptuous fountain whose upper basin overflows into the next level until it finally reaches the sea (Figure 11a). Although the iconological conception derives from the treatise Flores de Miraflores (De la Iglesia 1659), its iconographic formulation does not stem directly from that work, but rather from the Letanía Lauretana de la Virgen Santísima expresada en cincuenta y ocho estampas…, where Dornn introduced the fountain as the central motif of the ejaculation “Mater Divinae Gratiae”67 (Figure 11b). Once again, the image finds its origin in the Song of Songs,68 which favored its early assimilation into Marian thought within patristic literature as an attribute of purification. Ambrose of Milan (330–397) in the 4th century already presented it as a metaphor for Mary’s perpetual virginity,69 establishing a starting point that would be taken up and expanded upon by later authors. Thus, Ildefonsus of Toledo (607–667) expanded the image to emphasize the paradox of a sealed fountain as the origin of God incarnate, while also introducing the principle of Divine Maternity.70 Later, in the Middle Ages, theologians such as Bonaventure of Bagnoregio (ca. 1221–1274)71 and Alanus Varenius (15th–16th c.)72 reinterpreted the metaphor, linking it to divine grace, to Mary’s incorruptibility, and to the “enclosed garden” of the Song of Songs, progressively reinforcing the notion of a perfect fertility unaltered by sin. Finally, Antoninus of Florence (1389–1459) introduced a new nuance—one that Fr Nicolás (17th c.) would use centuries later73—by insisting on Mary’s purity despite her descent from the people of Israel, through the image of bitter water that becomes sweet as it flows from the fountain.74

On the same wall, concluding the series of wall-panel doors, we find the entrance to the spiral staircase (Figure 3, no. 7). The bas-relief depicts Mary “exalted as a palm,” for, as De la Iglesia notes: “If the Rose is the Queen of flowers, then the Palm is the Queen of trees” (De la Iglesia 1659, 4r. v). his recalls the traditional association of the palm with victory, although in this instance its iconographic representation differs markedly from the previous examples. It is no longer a question of isolated branches, but a complete palm tree, set within a desert landscape where a small building can be discerned on the horizon (Figure 12a), almost identical to that employed by Fr Nicolás in his first hieroglyph (Figure 12b). The scene, in particular, typologically reproduces the aforementioned miracle of the palm during the Flight into Egypt, with the walled city of Bethlehem in the background.75 Consequently, the palm in this tondo is not merely an attribute of victory, but embodies Mary herself: fertile in her virginity, incorrupt in her integrity, and hospitable in her assistance.

Continuing along the exegetical itinerary of the Marian discourse, we encounter the sculptural ensemble of the eight gilded cartouches, of casket-shaped typology with mixed-line profiles. The first of these is situated on the south wall, to the right of the entrance door to the room (Figure 3 ). The relief depicts Mary as the “Ark of the Covenant” of the Exodus,76 guarded by two cherubim77 (Figure 13a).

The Ark of the Covenant emerges as one of the most fruitful visual-theological metaphors of the Mariological dogma of the Divine Maternity. Already shortly after its establishment,78 Ambrose of Milan (340–397) drew a parallel between the “Ark of the Covenant,” which safeguarded the “tablets of the Law,” and “Mary,” who carried in her womb the “heir of the divine testament.” In doing so, the Bishop of Milan inaugurated a hermeneutical line that transcends mere analogy, opening a typological horizon in which the Old and New Covenants converge in the figure of the Virgin.79 This interpretive matrix, adopted and reworked by later treatises, was developed by authors such as John of Damascus (675–749)80 and Peter of Celle (1115–1183),81 who recognized in Mary not only the receptacle of the Son of God, but also the incarnation of Salvation itself. Later, in the scholastic sphere, Bonaventure (ca. 1221–1274) provided a decisive vision by incorporating another Marian principle—the virtue and incorruptibility of the Virgin—in relation to the golden construction of the Ark.82 Finally, in 1659, Brother Nicolás condensed the theses of his predecessors83 around his thirty-second hieroglyph (Figure 13b).

Continuing, above the door to the Wax Disposal Room (“Retrete” de la Cera) (Figure 3 ) the second cartouche is positioned, depicting Mary as the “Castle of Jesus or Tower of Ivory” (Figure 14a).

Both titles indirectly allude to the forty-third hieroglyph of Fr Nicolás de la Iglesia (Figure 14b), where the author describes this castle as a “tower” of purity and innocence, a victorious “armory,” and the “lodging” of the “Eternal Word”.84 However, his argument does not arise in isolation but is rooted in the medieval hermeneutical tradition reworked from interpretations such as those of Anselm of Canterbury (1033–1109) or Bernard of Clairvaux (1090–1153). Within this interpretive thread, the former introduces the principle of Mary’s perpetual purity through the metaphor of the walled tower,85 while the latter projects the Divine Maternity by analogy with the New Testament episode86 in which Martha, the sister of Lazarus, receives the Son of God into her home.87

At the same time, the Marian title “Tower of Ivory” draws its origin from the Song of Songs,88 whose poetic imagery, as in other emblems, lent itself naturally to theological transposition. In fact, already in chapter five of the Corana Beatae Virginis Mariae, included in the second volume of the Bibliotheca Virginalis, an anonymous author identified Mary as the “whitened tower of ivory” of the Holy Scriptures, thus anticipating the Mariological crystallization of the metaphor.89 It was, nevertheless, in the scholastic context that this conceptual symbolism attained systematic definition. Alain of Lille (ca. 1128–1203), though without elaborating a developed semiotic apparatus, associated ivory with the virtue of “chastity”.90 Finally, Albert the Great (ca. 1193/1206–1280) granted the Marian emblem its definitive formulation, attributing to the eburnean tower the values of spotless purity and the co-redemptive quality of the “innocent”.91

Next, above the door of the former Oratory, the third cartouche is located (Figure 3 ), adorned with a bas-relief in which an immaculate mirror appears in the foreground, struck by the rays of the Sun of Justice (Christ), which emerges from among the clouds. On the horizon, a small fortified building rises, possibly the walled city of Jerusalem (Figure 15a).

The motif of the mirror without blemish, or sine macula, together with the lily, is among the biblical figures92 that most effectively express Mary’s perpetual virtue in her three states (before, during, and after childbirth). Consequently, scholastic tradition soon recognized in the Virgin an immaculate mirror in which divinity contemplates itself. Building on this foundation, the Marian apologist Albert the Great (ca. 1193/1206–1280) appropriated this wisdom symbol to develop a line of interpretation in which the mirror functions both as the object of reflection and the reflected image itself, creating a metaphor in which the Virgin becomes the paradigm of grace and human virtue.93 On this basis, Bonaventure (ca. 1221–1274) intensified this interpretive line by introducing the dogma of Divine Maternity, emphasizing Mary’s incorruptibility as the enabling medium through which her Son’s Divine Grace is reflected.94 Later, at the threshold of the Early Modern period, Alanus Varenius (15th–16th c.) oriented the virginal emblem toward a luminous reciprocity, highlighting the divine concord between Christ and His Mother as the mutual radiance of a single resplendent light.95 Ultimately, in the Baroque period, Fr Nicolás de la Iglesia (17th c.) condensed the entire preceding tradition in his treatise Flores de Miraflores, under the forty-seventh hieroglyph, Mary, the Immaculate Mirror Here, the metaphor reaches its fullest expression: Mary no longer merely reflects light, but becomes itself the transparency of divine majesty, a flawless surface where the human and the eternal contemplate one another.96

Further along the north wall, on the right flank, rises the fourth cartouche (Figure 3 ). The bas-relief it houses constitutes a singularity within the visual program of the Sacristy of the Virgin, as it does not refer to the treatise Flores de Miraflores (De la Iglesia 1659). In it, Mary is represented as the “precious shell,” fertilized by the pure morning dew (Figure 16a).

Continuing the iconological development of the laurel and the cypress, the emblem of the shell (or oyster) is inspired by the empirical observations of Pliny the Elder (ca. 23–79), who described how the purity of the morning dew determines the quality of the pearl formed within the oyster (Pliny the Elder 2010a, p. 298). With the advent of Christianity, patristic and medieval theological traditions were quick to recognize in this naturalistic image a providential simile of the Immaculate Conception of Jesus Christ. Among the earliest Marian interpretations, Ambrose of Milan (340–397) established a Christological parallel with the pearl, implicitly recognizing Mary as the sacred receptacle that contains it.97 From this perspective, it was scholasticism that most broadly deployed this typology. Consequently, John of Damascus (675–749) articulated a catechetical metaphor of Divine Maternity, portraying the Virgin as the shell that, receiving the rays of divinity, conceives the priceless pearl within her.98 These conceptual foundations were later adopted and further elaborated by exegetes such as Armand of Belleau (ca. 1340)99 or Albert de Marquise (16th c.).100 Nonetheless, the significance of the Marian metaphor extended beyond theory to become a materially manifest feature in modern pious emblematic treatises. Sebastián Covarrubias (1539–1613), for instance, dedicated his eighty-sixth emblem in Emblemas Morales to this bivalve, albeit in a mythological key that could be readily applied to a Christian context (Covarrubias Orozco 1610, 186r), and the composition of the cartouche is practically identical to that in Covarrubias’ treatise (Figure 16b). Similarly, authors such as Theophilo Mariophilo (17th c.) and Luis Solis Villaluz (18th c.) incorporated the shell, respectively, to illustrate the litany Mater Inviolata in his Stella ex Jacob orta (Theophilo Mariophilo 1680, n. pag), and in his compendium of Virgin hieroglyphs (Solis Villaluz 1734, p. 271) (Figure 17a,b).

On the same wall is the fifth cartouche, adorned with a bas-relief depicting the emblem of the “starfish” (Figure 3 ), previously addressed on the inner side of the entrance door to the Sacristy of the Virgin (Figure 18a).

Immediately above the door of the holy-water stoup is placed the sixth cartouche (Figure 3 ). In it, Mary is presented under the dual image of the Sun and the Moon, referring to the Genesis passage depicted on the door of the former oratory (Figure 18b). Here, both celestial bodies are intertwined within a single composition to exalt her purity. Hence, the Moon—like the Sun—was adopted by scholastic thought as a theological figure of superlative virtue, grace, and hope, as already observed by the Benedictine cardinal Peter Damian (1007–1072).101 Over time, this formulation gave rise to a rich hermeneutic network. Authors such as Bonaventure (ca. 1221–1274)102 and Albert the Great (ca. 1193/1206–1280) enriched the cardinal’s reflections with their own nuances—particularly the latter, who introduced the concept of Mary as Co-Redemptrix and guide of sinners.103 In this way, the metaphor gradually expanded toward more complex horizons. In his ninth hieroglyph (Figure 19),104 Fr Nicolás, while maintaining the theses of his predecessors, associated the Moon with the apocalyptic verse of the “woman clothed with the sun”.105

Subsequently, above the entrance to the spiral staircase, the penultimate cartouche is positioned (Figure 3 ), in which Mary is revealed as the biblical “Throne of Solomon”106 (Figure 20a). Although Fr Nicolás (De la Iglesia 1659) dedicated his forty-fifth hieroglyph to this emblem, the iconography of the relief studied here draws more immediately from the print of the Sedes Sapientiae invocation in Francisco Xavier Dornn’s Litany of Loreto (18th c.) (Figure 20b).

The royal seat has long been regarded in theology as one of the most eloquent features for expressing Divine Maternity. Yet, as Carme Calderón observes, this motif is not limited to its maternal aspect, since its elements were often interpreted as metaphors for Marian virtues (López Calderón 2016, p. 419). As early as the first decades of the 13th century, Anthony of Padua (1195–1231) wove a delicate parallel between the throne’s morphology and the qualities of the Virgin, opening an interpretive line that extended across the following centuries.107 Moreover, the Throne of Solomon acquired greater depth when it was endowed with a Trinitarian significance: Mary as the seat sustaining Divine Wisdom, that is, Christ the Word (the book in the bas-relief) incarnate, and, in Him, the Scriptures through which God’s knowledge is revealed. Building upon this, Bonaventure (ca. 1221–1274) added to the Mariological narrative the notion of Mary as the true seat of the Trinity, deepening the apologia of the Virgin as Sedes Sapientiae.108

The sequence concludes with the last cartouche, located on the left flank of the main entrance to the Sacristy of the Virgin (Figure 3 ), where Mary is revealed as the “burning bush of Moses”109 (Figure 21a). This biblically rooted motif is reinterpreted in Marian terms as an exaltation of her incorrupt virginity. Nevertheless, the bush embodies a deeper significance, serving as a manifest sign of her superiority as the one chosen by God, through a visual paraphrase of the passage from Exodus: “Ego sum qui Sum”.110

Already in the early Middle Ages, John of Damascus (675–749) reformulated it to transform it into a laudatory sign of the preservation of grace following the Divine Conception.111 Consequently, its Mariological interpretation inaugurated a hermeneutical line that, over the centuries, was adopted and expanded by authors such as Bernard of Clairvaux (1090–1153),112 Bonaventure (ca. 1221–1274)113 and Peter Berchorius (ca. 1290–1362),114 who not only emphasized the virginal conception but also explicitly highlighted her triumph over “the corruption of the flesh” and concupiscence in its three stages (before, during, and after childbirth). Finally, Fr Nicolás de la Iglesia (1659), in his thirteenth hieroglyph (Figure 21b), introduced an interpretative shift by linking, within the metaphor of the bush’s active preservation from fire, the passive incorruptibility of the doctrine of the Immaculate Conception of Mary.115

Lastly, the Marian iconographic cycle of the Sacristy of the Virgin culminates in the eight medallions, masterfully arranged so that, from the very entrance door, the viewer’s gaze converges on the north wall at the far end of the room, where the inscription begins: AVE MARIA116 (Figure 22). This is the most primordial and eminent praise to the Virgin—the Angelic Salutation at the Annunciation. Within it lies the seed of Mary’s sanctification as the Chosen One to embody the Son of God. Thus, this laudation stands as a synthesis of the discourse unfolded throughout the Sacristy of the Virgin, reminding the faithful that every allegory, emblem, and symbol finds its origin in that foundational moment.

3. Conclusions

The iconographic cycle of the Sacristy of the Virgin unfolds a visual storyline in which each bas-relief stands as a living testimony to the Marian precepts of Divine Maternity, purity, Co-Redemption, and superiority over earthly and celestial creatures—with the exception of the Sacred Triad. The arrangement of these elements, culminating in the medallions inscribed with AVE MARIA, guides the viewer’s gaze from the entrance to the north wall, offering a visual summary of the Marian message where instructional function and devotion are inseparably intertwined. Through this journey, the motifs engage with the patristic, Scholastic and Baroque hermeneutical traditions, integrating Old Testament references, biblical poetry, and theological reflection. In this manner, a continuous typological thread is established, in which the Old and New Covenants converge in the figure of Mary, producing a figurative narrative in which each emblem interacts with the next to form a unified and progressive discourse.

Accordingly, the Sacristy of the Virgin emerges as a genuine iconographic breviary, where heritage and devotion unite to provide the viewer with a comprehensive encounter with Baroque Mariology. The careful arrangement of elements and their relation to exegetical and emblematic literature allows the Virgin to be perceived not only as an object of veneration but also as a theological paradigm and an aesthetic model of divine perfection, capable of guiding contemplation and devotion, thus transforming the space into a true spiritual itinerary.