Brother of Giuliano Giamatti da Sangallo. Born in Florence, Italy in 1455; died there in 1534. He was engaged by Pope Alexander VI to erect the fortification of the Castel Sant' Angelo and the fort Civita Castellana. He later erected the church of Madonna di San Biagio at Montepulciano, one of the handsomest in Italy, as well as many splendid palaces, and became chief engineer of the fortifications of Florence.