Florence Cathedral (Italian: Duomo di Firenze), formally the Cathedral of Saint Mary of the Flower (Italian: Cattedrale di Santa Maria del Fiore [katteˈdraːle di ˈsanta maˈriːa del ˈfjoːre]), is the cathedral of the Catholic Archdiocese of Florence in Florence, Italy. Commenced in 1296 in the Gothic style to a design of Arnolfo di Cambio and completed by 1436 with a dome engineered by Filippo Brunelleschi, the basilica's exterior is faced with polychrome marble panels in various shades of green and pink, alternated by white, and features an elaborate 19th-century Gothic Revival western façade by Emilio De Fabris.
The cathedral complex, in Piazza del Duomo, includes the Florence Baptistery and Giotto's Campanile. These three buildings are part of the UNESCO World Heritage Site covering the historic centre of Florence and are a major tourist attraction of Tuscany. The basilica is one of world's largest churches and its dome is still the largest masonry dome ever constructed. The cathedral is the mother church and seat of the Archdiocese of Florence, whose archbishop is Gherardo Gambelli.
History
Santa Maria del Fiore was built on the site of Florence's second cathedral dedicated to Saint Reparata; the first bishop's seat was the Basilica of San Lorenzo, the initial building of which was consecrated as a church in 393 by St. Ambrose of Milan. The ancient structure, founded in the early 5th century and having undergone many repairs, was crumbling with age, according to the 14th-century Nuova Cronica of Giovanni Villani, and was no longer large enough to serve the growing population of the city. Other major Tuscan cities had undertaken ambitious reconstructions of their cathedrals during the Late Medieval period, such as Pisa and particularly Siena where enormous proposed extensions were never completed.
The city council of Florence approved Arnolfo di Cambio's design for the new church in 1294. Di Cambio was also architect of the church of Santa Croce and the Palazzo Vecchio. He designed three wide naves ending under an octagonal dome, with the middle nave covering the area of Santa Reparata. The first stone was laid on 9 September 1296, by Cardinal Valeriana, the first papal legate ever sent to Florence. The building of this vast project was to last 140 years; Arnolfo's plan for the eastern end, although maintained in concept, was greatly expanded in size.
After Arnolfo died in 1302, building of the cathedral slowed for almost 50 years. When the relics of Saint Zenobius were discovered in 1330 in Santa Reparata, the project gained a new impetus. In 1331, the Arte della Lana, the guild of wool merchants, took over patronage for the construction of the cathedral and in 1334 appointed Giotto to oversee the work. Assisted by Andrea Pisano, Giotto continued di Cambio's design. His major contribution was to design and begin the construction of the campanile. When Giotto died on 8 January 1337, Andrea Pisano continued the building until work was halted due to the Black Death in 1348.
In 1349, action resumed on the cathedral under a series of architects, starting with Francesco Talenti, who finished the campanile and enlarged the overall project to include the apse and the side chapels. In 1359, Talenti was succeeded by Giovanni di Lapo Ghini (1360–1369) who divided the centre nave into four square bays. Other architects were Alberto Arnoldi, Giovanni d'Ambrogio, Neri di Fioravanti and Andrea Orcagna. By 1375, the old church of Santa Reparata was pulled down. The nave was finished by 1380, and only the dome remained incomplete until 1436.
On 19 August 1418, the Arte della Lana announced an architectural design competition for erecting Neri's dome. The two main competitors were two master goldsmiths, Lorenzo Ghiberti and Filippo Brunelleschi, the latter of whom was supported by Cosimo de' Medici. Ghiberti had been the winner of a competition for a pair of bronze doors for the Baptistery in 1401 and lifelong competition between the two seem to remain. Brunelleschi won and received the commission.
Ghiberti, appointed coadjutor, drew a salary equal to Brunelleschi's and, though neither was awarded the announced prize of 200 florins, was promised equal credit, although he spent most of his time on other projects. When Brunelleschi became ill, or feigned illness, the project was briefly in the hands of Ghiberti, but soon he supposedly had to admit that the whole project was beyond him. In 1423, Brunelleschi was back in charge and took over sole responsibility.
Erection of the dome had begun in 1420 and was finished in 1436. The cathedral was consecrated by Pope Eugene IV on 25 March 1436, the first day of the year according to the Florentine calendar. It was the first 'octagonal dome in history to be built without a temporary wooden supporting frame. During the consecration in 1436, Guillaume Dufay's motet Nuper rosarum flores was performed.
The decoration of the exterior of the cathedral, begun in the 14th century, was left unfinished after the initial works done by Arnolfo di Cambio, which led Lorenzo de' Medici to initiate a design competition for the façade between 1490 and 1491. The competition went ultimately nowhere, and the façade wasn't installed until the 19th century, in 1887, with the fabrication of Emilio De Fabris' polychrome marble design. The floor of the church had been relaid in marble tiles in the 16th century.
The exterior walls are faced in alternate vertical and horizontal bands of polychrome marble from Carrara (white), Prato (green), Siena (red), Lavenza and a few other places. De Fabris had to copy the initially Romanesque cladding style peculiar to Tuscan church architecture such as the earlier baptistery (Battistero di San Giovanni), and Giotto's bell tower. There are two major side doors near the crossing: the Porta dei Canonici on the south side and the Porta di Mandorla to the north. The mandorla with the Madonna of the Girdle surrounded by angels was sculpted by Nanni di Banco. Nanni who worked with his father and others on the door, died way too early before the portal was completed. Nanni and the befriended young Donatello provided two youthful prophet figures for the top of the pinnacles flanking the portal which are now in the Museo dell'Opera del Duomo. The six side windows, notable for their delicate tracery and ornaments, are separated by pilasters. Only the four windows closest to the transept admit light; the other two are merely ornamental. The clerestory windows are round, a common Italian Gothic feature.
Exterior
Plan and structure
The cathedral of Florence is built as a basilica, having a wide central nave of four square bays, with an aisle on either side. The chancel and transepts are of identical polygonal plan, separated by two smaller polygonal chapels. The whole plan forms a Latin cross. The nave and aisles are separated by wide pointed Gothic arches resting on composite piers.
Its arrangement of trilobate -three lobe- apses was intended to evoke the form of a flower, as a homage to Fiorenza, the "city of flowers".
The dimensions of the building are enormous: building area 8,300 m2 (89,340 sq ft), length 153 m (502 ft), width 38 m (125 ft), width at the crossing 90 m (300 ft). The height of the arches in the aisles is 23 m (75 ft). The height of the dome is 114.5 m (375.7 ft). It has the fifth tallest dome in the world.
Planned sculpture for the exterior
The Overseers of the Office of Works of Florence Cathedral, the Arte della Lana, had plans to commission a series of twelve large Old Testament sculptures for the buttresses of the cathedral. Donatello, then in his early twenties, was commissioned to carve a statue of David in 1408, to top one of the buttresses, though it was never placed there. Nanni di Banco was commissioned to carve a marble statue of Isaiah, at the same scale, in the same year. One of the statues was lifted into place in 1409, but was found to be too small to be easily visible from the ground and was taken down; both statues then languished in the workshop of the opera for several years. In 1409–1411 Donatello made a statue of a sitting Saint John the Evangelist which until 1588 was in a niche of the old cathedral façade. Between 1415 and 1426, Donatello created five statues for the campanile of Santa Maria del Fiore. These are the Beardless and the Bearded Prophet (both from 1415); the Sacrifice of Isaac (1421); Habbakuk (1423–25); and Jeremiah (1423–26); which follow the classical models for orators and are characterised by strong portrait details. A figure of Hercules, in terracotta, was commissioned from the Florentine sculptor Agostino di Duccio in 1463 and was made perhaps under Donatello's direction. A statue of David by Michelangelo was completed 1501–1504 although it could not be placed on the buttress because of its six-ton weight. In 2010 a fiberglass replica of "David" was placed for one day on a roof-top buttress for a chapel's dome.
Dome
After a hundred years of construction and by the beginning of the 15th century, the structure was still missing its dome. The basic features of the dome had been designed by Arnolfo di Cambio in 1296. His brick model, 4.6 m (15.1 ft) high, 9.2 m (30.2 ft) long, was standing in a side aisle of the unfinished building, and had long been sacrosanct. It called for an octagonal dome higher and wider than any that had ever been built, with no external buttresses to keep it from spreading and falling under its own weight.
The commitment to reject traditional Gothic buttresses had been made when Neri di Fioravanti's model was chosen over a competing one by Giovanni di Lapo Ghini. That architectural choice, in 1367, was one of the first events of the Italian Renaissance, marking a break with the Medieval Gothic style and a return to the classic Mediterranean dome. Italian architects regarded Gothic flying buttresses as ugly makeshifts. Furthermore, the use of buttresses was forbidden in Florence, as the style was favored by central Italy's traditional enemies to the north. Neri's model depicted a massive inner dome, open at the top to admit light, like Rome's Pantheon, partly supported by the inner dome, but enclosed in a thinner outer shell, to keep out the weather. It was to stand on an unbuttressed octagonal drum. Neri's dome would need an internal defense against spreading (hoop stress), but none had yet been designed.
The building of such a masonry dome posed many technical problems. Brunelleschi looked to the great dome of the Pantheon in Rome for solutions. The dome of the Pantheon is a single shell of concrete, the formula for which had long since been forgotten. The Pantheon had employed structural centring to support the concrete dome while it cured. This could not be the solution in the case of a dome this size and would put the church out of use. For the height and breadth of the dome designed by Neri, starting 52 m (171 ft) above the floor and spanning 44 m (144 ft), there was not enough timber in Tuscany to build the scaffolding and forms. Brunelleschi chose to follow such a design and employed a double shell, a form of construction with earlier precedents in Persian and Central Asian architecture. Both shells were built of brick, chosen for its light weight compared to stone and the ease of forming it in place, and raised with nothing supporting them from below during construction. Sandstone and marble were reserved for the tension chains, the ribs and the lantern. To illustrate his proposed structural plan, he constructed a wooden and brick model with the help of Donatello and Nanni di Banco, a model which is still displayed in the Museo dell'Opera del Duomo. The model served as a guide for the craftsmen, but was intentionally incomplete, so as to ensure Brunelleschi's control over the construction.
Brunelleschi's solutions were ingenious. The spreading problem was solved by a set of four internal horizontal stone and iron chains, serving as barrel hoops, embedded within the inner dome: one at the top, one at the bottom, with the remaining two evenly spaced between them. A fifth chain, made of wood, was placed between the first and second of the stone chains. Since the dome was octagonal rather than round, a simple chain, squeezing the dome like a barrel hoop, would have put all its pressure on the eight corners of the dome. The chains needed to be rigid octagons, stiff enough to hold their shape, so as not to deform the dome as they held it together.