 On April 17, 1555, Florence and Spain occupied the territory of Siena, which, in July 1557 Philip II of Spain bestowed on Cosimo as a hereditary fiefdom.The ducal family moved into the Palazzo Pitti in 1560.Cosimo commissioned the architect Vasari to build the Uffizi, as offices for the Medici bank, continuing the Medici tradition of patronage of the arts.