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Marian iconography in Florence's cathedral [preserved from article for editing]

There are many Marian artworks in the Cathedral. But by focusing on individual items we will miss a bigger picture that was known by Florentines at the time but is hidden in plain sight for modern viewers, namely that all its major artworks work together to make the cathedral as a whole an homage to the Virgin Mary and a recognition of her intercession capacity; through which she acts as a conduit to Christ's grace and mercy. The iconographic program which defined the topic of each artwork and even its placement in Santa Maria del Fiore was defined according to this objective and was supervised by the canon, the governing body of the cathedral, during the two centuries it took to complete the cathedral's decoration.

View of Mary as the mother of an incarnate Christ

The intercession capacity of Mary was not always part of the church's theological framework. In the 13th century, there was a major change in the Catholic church across Europe in the way Christ was viewed. Before, Christ had been considered as a distant judge and authority figure. The new view shifted towards a Christ that had had a physical existence, including human emotions and bodily experiences. In theology this view is called incarnational awareness. As a result of this focus on the human nature of Jesus, the importance of Mary was elevated, as she was the source of the body Christ had incarnated. It is this incarnational awareness that is behind the iconographic program of the major works in Santa Maria del Fiore.

The Flower and Isaiah's prophecy

Up until 1296 the cathedral was dedicated to Saint Reparata, considered up to that point the patroness of Florence. But the Florentian diocese decided that year to rededicate the cathedral —and as a result the city as a whole — to the Virgin Mary, under the specific title of "Our Lady of the Flower", thus making a direct connection to the city name, Florentia.By naming the cathedral after the "flower", Florence consciously connected its own identity to a biblical prophecy from the Book of Isaiah which mentions a "stem" rising from the root of the descendants of Jesse, the father of King David. In the latin Vulgate Bible used in the Middle Ages, the passage makes a direct reference to a flower or "flos".

et egredietur virga de radice Iesse et flos de radice eius ascendet (Isaiah 11:1).

In modern translation:

But a shoot shall grow out of the stump of Jesse, a twig shall sprout from his stock.

Thus, the Latin translation introduced the word flos as part of the prophecy as well as virga, meaning "shoot" or "green twig" in Latin; similar to the Latin "virgo" or virgin, which reinforces the reading of this prophetic passage as Christ, the flower, being created from Mary, the "virga". The prophesy was understood as Mary being the stem and Christ the flower of salvation.

The First Façade as a Marian Frontispiece

Unlike many Northern European Gothic cathedrals that prioritised the Last Judgment on their main portals, Santa Maria del Fiore was designed to be a visual narrative of the life and glory of the Virgin. The original project for the cathedral’s façade, led by the architect and sculptor Arnolfo di Cambio (destroyed to build the new exterior in the 15th century but reconstructed in a 1:1 scale in the Museo dell' Opera del Duomo, the cathedral's museum), was conceived as a monumental Marian frontispiece in which the three main portals were dedicated to her birth, her role as the Mother of God, and her death.

The central portal featured a monumental sculptural group of the Virgin Mary enthroned with the Christ Child. Known popularly as the "Madonna with the Glass Eyes" due to the glass used for the pupils, this work represented a breakthrough in the depiction of sacred figures. The sculpture moved away from the ethereal, distant figures of the Byzantine tradition toward a more lifelike depiction. This stylistic choice emphasised the human reality of the Mother and Child as a direct consequence of the increased incarnational awareness in the church.

The side portals reinforced this narrative. The left portal featured reliefs depicting the Nativity of the Virgin, while the right portal was dedicated to her "Dormition" or death. This sequence ensured that every person entering the cathedral was met with the complete earthly cycle of the woman through whom the "Flower" of salvation had bloomed.

• Sculptures of Mary decorating the old façade by the workshop of Arnolfo di Cambio (ca. 1300-1310)
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  Madonna with the Glass Eyes, Museo dell' Opera del Duomo, Florence.
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  Nativity of the Virgin, Museo dell' Opera del Duomo, Florence.
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  Dormition of the Virgin, Bode Museum, Berlin.

The Transition of the Counter-Façade: From Death to Glory

The impact of Marian devotion is most clearly seen in the spatial relationship between the exterior and interior of the cathedral. While the exterior façade recorded Mary’s earthly life and death, the interior "counter-façade" (the wall inside the main entrance) was reserved for her heavenly triumph. This created a deliberate narrative arc for the believer: moving from the physical world into the sacred space of the church was symbolic of passing from mortality to eternal life. Thus, positioned directly above the central door inside the nave is a large, gleaming gold mosaic of the Coronation of the Virgin (attributed to Gaddo Gaddi). This work serves as the theological climax of the exterior narrative. As the worshipper turns back to look at the entrance, they see Mary not in the throes of death —as she was depicted on the exterior portal— but being crowned by her Son in the "luminous life of heaven." The choice of mosaic, with its reflective gold leaf, was intended to contrast with the more somber, unpainted stone of the interior, acting as a metaphor for the divine light of the afterlife.

• Monumental artworks inside the cathedral
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  Gaddo Gaddi (attr.), Coronation of the Virgin (c. 1300-1310).
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  Donatello and Domenico di Piero da Pisa, Nativity of the Virgin (1433-37), Glass stained window of the drum of the dome.

The Porta della Mandorla and the Renaissance Shift

As the cathedral’s construction progressed into the 15th century, the focus on Mary’s physical elevation to heaven became a central theme for early Renaissance sculptors. The most significant example of this is found on the "Porta della Mandorla," the north side door of the cathedral; the tympanum of this door features Nanni di Banco’s relief of the Assumption (see image above). The Virgin is shown seated within a "mandorla", an almond-shaped aureole of light, being carried upward by vigorous, muscular angels.

The devotion to the Virgin’s Assumption provided artists with a justification for studying the human form; if Mary’s body was taken whole into heaven, then the physical human body was inherently worthy of being depicted with classical dignity and grace. The "theology of hope" expressed here suggests that Mary’s physical glorification is a promise of the future resurrection and elevation of all human nature.

The Sacred Axis: Alignment and Light

Lorenzo Ghiberti, The Assumption of the Virgin (1404-5). Stained glass window of the façade.

The interior arrangement of Santa Maria del Fiore was carefully calibrated to create a "sacred axis" that focused the viewer’s attention on Mary. This axis was defined by a line of sight that stretched from the Gaddi mosaic at the entrance, through the nave, to the high altar, and finally up to the stained-glass windows of the drum and dome.

The great rose window of the façade, designed by Lorenzo Ghiberti, depicts the Assumption of the Virgin. When the sun sets, it illuminates this window, casting coloured light into the nave. This light serves a dual purpose: it beautifies the space and acts as a visual reminder of the "Woman Clothed with the Sun" from the Book of Revelation. The light of the sun, filtered through the image of the Virgin, was seen as a manifestation of divine grace entering the civic space of Florence.