The church of Sant’Agostino, located on the Prato di Sant’Agostino, is one of Siena’s most important sacred buildings, both from the architectural and the art-historical points of view, thanks to the great number of masterpieces it contains. Building began in 1259 when some Hermits of Saint Augustine, after official recognition of their order by Pope Alexander IV, bought for 220 lire two . . .