A brick fountain-house built in 1246 in the lower town below San Domenico — the largest of Siena's medieval fountains, with three pointed arches and the city's wolf-and-twins coat of arms above the central one. The water comes from the bottini and once supplied the leather-tanners and wool-dyers of the Fontebranda quarter.
The neighbourhood around it, in the Oca (Goose) contrada, was where Catherine of Siena grew up. The fountain is briefly mentioned by Dante in the Inferno, as Maestro Adamo confesses he gave up everything for the joy of imagining a sip of its water.