The bridge spans the Arno at its narrowest point, where it is believed that a bridge was first built in
Roman times, when the
via Cassia crossed the river at this point. It was rebuilt in 1345. This location marks one of the earliest crossings of the Arno in Florence, possibly originating from Roman times or even before. Although floods have repeatedly damaged it, the current bridge has stood since approximately 1339-1345. For many years, the only older bridge in the city was the
Rubaconte bridge, built nearly a century earlier. But after significant 19th-century modifications to that structure and its destruction in 1944, the Ponte Vecchio claimed its title as the oldest bridge in Florence.
Giorgio Vasari recorded the traditional view of his day that attributed its design to
Taddeo Gaddi The
Torre dei Mannelli was built at the southeast corner of the bridge to defend it. The bridge consists of three segmental arches: the main arch has a span of , and the two side arches each span . The rise of the arches is between 3.5 and 4.4 metres (11½ to 14½ feet), and the span-to-rise ratio is 5:1. The shallow segmental arches, which require fewer piers than the
semicircular arch traditionally used by Romans, enabled ease of access and navigation for animal-drawn carts. Another notable design element is the large
piazza at the center of the bridge that
Leon Battista Alberti described as a prominent ornament in the city. A stone with an inscription from
Dante (
Paradiso xvi. 140-7) records the spot at the entrance to the bridge where
Buondelmonte de' Buondelmonti was murdered by the
Amidei clan in 1215, which began the urban fighting of the
Guelfs and Ghibellines. The bridge has always hosted shops and merchants who displayed their goods on tables before their premises, after authorization by the
Bargello (a sort of a lord mayor, a magistrate and a police authority). == Later additions and changes ==