Antonio da Sangallo the Younger (1483–1546) was the most influential architect of his time. He arrived in Rome when he was about 20 and built a town house for Cardinal Alessandro Farnese in 1513, and when the Cardinal became Pope Paul III, he had Antonio the Younger enlarge it into the most imporant palace in Rome, the Palazzo Farnese (1534–46). A fortress-like, 16th-century Florentine palace, this structure was representative of a type of building on which a code of academic rules was based, exercising an immense influence well into the 19th century. The inner court of the palace ...