The Basilica di Santa Maria del Fiore is the cathedral church of Florence. The Duomo, as it is ordinarily called, was begun in 1296 in the Gothic style to the design of Arnolfo di Cambio and completed structurally in 1436 with the dome engineered by Filippo Brunelleschi. The exterior of the basilica is faced with polychrome marble panels in various shades of green and pink bordered by white and has an elaborate 19th century Gothic Revival façade by Emilio De Fabris.
Santa Maria del Fiore was built on the site of an earlier cathedral dedicated to Saint Reparata. The ancient building, founded in the early 5th century and having undergone many repairs, was crumbling with age, as attested in the 14th century Nuova Cronica of Giovanni Villani,[2] 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, as seen at Pisa and particularly Siena where the enormous proposed extensions were never completed.
The new church was designed by Arnolfo di Cambio and approved by city council in 1294. Arnolfo di Cambio was also architect of the church of Santa Croce and the Palazzo Vecchio. He designed three wide naves ending under the octagonal dome, with the middle nave covering the area of Santa Reparata. The first stone was laid on September 9, 1296 by Cardinal Valeriana, the first papal legate ever sent to Florence. The building of this vast project was to last 170 years.