According to the Italian Renaissance biographer
Giorgio Vasari, Agostino was born into a
Sienese family of sculptors and architects, and studied in the workshop of
Giovanni Pisano. In 1285, aged only fifteen, he would collaborate in the façade of the
Cathedral of Siena with Giovanni. However, modern scholars assign his birth around 1285 and that he perhaps studied in the workshop of Camaino di Crescentino, the father of
Tino di Camaino. He is often documented as collaborator of other artists, such as
Agnolo di Ventura, with whom he executed the
cenotaph of
Guido Tarlati in the
Cathedral of Arezzo (signed and dated 1330). Vasari mentions Agnolo and Agostino in several commissions from the commune of Siena, including the
Porta Romana and the
Torre del Mangia; his collaboration at the construction is documented in 1339. He is also mentioned in regard with the construction of fortifications at
Massa Marittima. Agostino's exact date of death is unknown, although a document of 27 June 1347 mentions him as no more living. His sons
Giovanni and Domenico were also sculptors. ==Sources==