 Complete the following phrase:  Polidoro Caldara was born in Caravaggio, in what is now Lombardy. According to Vasari, whilst working as a labourer carrying the materials for the builders of the Vatican logge he ingratiated himself with the artists, and attracted the admiration of Maturino da Firenze, one of Raphaels main assistants in the ongoing decoration of the Vatican. He then joined Raphaels large workshop, in about 1517, and worked on the Raphael Rooms in the Vatican. He and Maturino then set up as painters of palace facades, usually in sgraffito, with considerable success until the 