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.
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You should check out Siena's 16th-century Mannerist group of painters.
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The only works worth checking out are Duccio & Pietro; everything that came after was a pale imitation.