San Giorgio in Siena was consecrated in 1731; it has an impressive travertine façade which is considered the city’s finest. One of its treasures is a painting of the Crucifixion by Francesco Vanni (1601-02). The renowned artist is buried in a tomb inside the church (1656) created by his sons, Raffaello and Michelangelo - found to the left of the main entrance. The bell tower is the work of Del Dugento. Some consider it was built to celebrate the victory of Montaperti (1260). The 38 windows are said to represent the number of companies of knights taking part in the battle.