of which their walls are built: brick-making was a monopoly of the commune, which saw to it that standards were maintained. At the foot of the Palazzo Pubblico's wall is the late Gothic Chapel of the Virgin built as an ex voto by the Sienese, after the terrible Black Death of 1348 had ended. Fonte Gaia The Fonte Gaia ("Joyous Fountain") was built in 1419 as an endpoint of the system of conduits bringing water to the city's centre, replacing an earlier fountain completed about 1342 when the water conduits were completed. Under the direction of the Committee of Nine, many miles of tunnels were constructed to bring water in aqueducts to fountains and thence to drain to the surrounding fields. The present fountain, a center of attraction for the many tourists, is in the shape of a rectangular basin that is adorned on three sides with many bas-reliefs with the Madonna surrounded by the Classical and the Christian Virtues, emblematic of Good Government under the patronage of the Madonna. The white marble Fonte Gaia was originally designed and built by Jacopo della Quercia, whose bas-reliefs from the basin's sides are conserved in the Ospedale di St. Maria della Scala in Piazza Duomo. The former sculptures were replaced in 1866 by free copies by Tito Sarrocchi, who omitted Jacopo della Quercia's two nude statues of Rhea Silvia and Acca Larentia, which the nineteenth-century city fathers found too pagan or too nude. When they were set up in 1419, Jacopo della Quercia's nude figures were the first two female nudes, who were neither Eve nor a repentant saint, to stand in a public place since Antiquity. Notes External links Buildings and structures in Siena Campo, Piazza del Tourist attractions in Tuscany