Antonio da Sangallo the Younger

Antonio da Sangallo the Younger was a Florentine architect of the High Renaissance, active mainly in Rome. He designed the Palazzo Farnese for Cardinal Alessandro Farnese, later Pope Paul III, served as chief architect of St Peter's Basilica and built fortifications for the Papal States, including the Fortezza da Basso in Florence. For the Farnese he also worked on their new capital at Castro.