Besides the works of the 14th-century masters Duccio , Pietro , and Ambrogio Lorenzetti , as well as Simone Martini , see Siena 's 16th-century Mannerists , painting at a time when the Renaissance teetered on the brink of effete Beccafei 's dreamy Birth of Mary and a highly decorative Christ at the Column by Sodoma .
You should check out Siena 's 16th-century Mannerist group of painters .