Antonio da Sangallo the Younger, born Antonio Cordiani in Florence 1484, was an Italian architect active during the Italian Renaissance.
When he was young he went to Rome to become a pupil of Bramante He lived and worked in Rome most of his life, and was very often employed by several of the popes. He became the chief architect for Saint Peter in 1520.
After the Sack of Rome (1527), he mainly worked in other cities, as military architect: he designed, for example, the fortifications of Ancona.
Palazzo Baldassini in Rome.
Churches of Santa Maria di Loreto and San Giovanni dei Fiorentini in Rome.
Villa Madama in Rome (started 1518).
St. Peter's Basilica in Rome (chief architect from 1520 on).
Palazzo Farnese in Rome