And AGNOLO (or ANGELO ) DA SIENA , Italian architects and sculptors inj 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 Porto 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 executed in 1330 the tomb of Bishop Guido Tarlati in the cathedral of Arezzo, which Giotto 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.