AGOSTINO and Agnolo or Angele, two brothers, sculptors and architects, born at Siena about 1269. Educated in their profession by Giovanni, a Pisan architect, they were named architects of their native city, where they constructed many edifices for secular and religious uses. They also executed, from the plans of Giotto, the tomb of Guido, bishop of Arezzo, one of the finest architectural monuments of the 14th century.