Tradition holds that the church was then rebuilt with donations made by the German mercenaries fighting alongside the Sienese in the 1260 Battle of Montaperti, where it is said the militia had called on Saint George for help in defeating the Guelf Florentine army.
The current appearance dates to the intervention of architect Pietro Cremona, who finished its reconstruction in 1738.
The façade is characterized by two giant columns and the coat of arms of Cardinal Anton Felice Zondadari, patron of the restoration.
The transept houses the tombs of two member of the Zondadari family with a painting by F. Janssens.
The tall Romanesque-style brick belltower, located just east of the apse and not easily visible from the street in front of the facade, was erected after the battle of Montaperto, the thirty-six windows represent the different Contrade.