Florence Consecrates Its Cathedral Under Brunelleschi’s Dome

On March 25, 1436, Pope Eugene IV consecrated Santa Maria del Fiore in Florence on the opening day of the Florentine new year. The ceremony took place inside a vast basilica that had stood unfinished for over a century, lacking a roof across its enormous central span. For this momentous civic and religious service, composer Guillaume Dufay presented his motet Nuper rosarum flores. The consecration signaled the completion of an audacious engineering undertaking: the raising of the largest masonry dome ever built, crowning a church whose foundation stone had been laid in 1296.

The cathedral project originated under the direction of Arnolfo di Cambio, who planned an ambitious three-aisled basilica terminating beneath an octagonal dome. By the mid-fourteenth century, Florence had committed to a bold civic monument without relying on Gothic flying buttresses, which were rare in Italy and which many Italian builders thought ugly and awkward. When Neri di Fioravanti's expanded design was adopted in 1367, it called for an unbuttressed octagonal drum raised high above the floor and spanning an internal width of about forty-five meters. For decades, the nave was brought to completion, but the practical means to enclose such a cavernous space remained an unresolved dilemma.