In order to connect the Palazzo Vecchio (Florence's town hall) with the Palazzo Pitti, in 1565 Cosimo I de' Medici had Giorgio Vasari build the Vasari Corridor above it. To enforce the prestige of the bridge, in 1593 the Medici Grand Dukes prohibited butchers from selling there; their place was immediately taken by several gold merchants. The corporative association of butchers had monopolised the shops on the bridge since 1442. 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 on behalf of the Amidei, in 1215, initiating the urban fighting of the Guelfs and Ghibellines.