Antonio da Sangallo, born in Florence in 1485, was the nephew of two da Sangallo architects, Giuliano and Antonio the Elder. He trained under their tutelage before arriving in Rome in approximately 1503. Although obviously influenced by his uncles, his architecture proved to adhere to the classicism of the High Renaissance. da Sangallo designed numerous architectural projects throughout his life, such as the interior of Capella Paolina in the Vatican, Palazzo Palma-Baldassini, Rome, in 1520, Palazzo Sacchetti, Rome, begun in 1542, and Palazzo Baldassini, which evokes the architecture of ancient Rome with its massive masonry. After a period as Raphael’s assistant, in 1539 he became the chief architect for St. Peter’s and supplied designs for the alteration of Bramante’s plan (Musgrove, 1987). Although not executed, his plan advocated altering the Greek plan into a more traditional cathedral plan, considering liturgical requirements. For many years he was employed as a military enginee...