AGOSTINO and AGNOLO (or Angelo) DA SIENA, two brothers, architects and sculptors, who flourished in the first half of the 14th century. Della Valle and other commentators deny that they were brothers. They certainly studied together under Giovanni Pisano, and in 1317 were jointly appointed architects of their native town, for which they designed the Porta Romana, the church and convent of St Francis, and other buildings. On the recommendation of the celebrated Giotto, who styled them the best sculptors of the time, they were chosen to execute the tomb of Guido, bishop of Arezzo, which that artist had designed. It was esteemed one of the finest artistic works of the 14th century, but unfortunately was destroyed by the French under the Duke of Anjou.

AGOSTINO, Paolo, an eminent Italian musician, born at Valerano in 1593. He studied under Nanini, and succeeded Ugolini as conductor of the Pope’s orchestra in St Peter’s. His musical compositions are numerous and of great merit, an Agnus Dei for eight voices being specially admired. He died in 1629.