Filippo Belforti

Filippo Belforti (1319–1358), son of Ottaviano Belforti, became bishop of Volterra in 1348, the year his brothers became the city's lords, and held the see until his death. The bishops' old imperial powers had become theoretical, and the diocese was poor. After consecration at Avignon he returned in 1350 to nearly exhausted silver mines and a shortage of priests, and taxed his clergy.

In 1352 he sold the disputed castle of Montecastelli to the commune for sixteen thousand livres. In 1355 he attended Emperor Charles IV's coronation in Rome and won confirmation of the see's jurisdiction and privileges, and he protested when Volterra's envoys swore allegiance to the emperor, a right he claimed for the bishop.

Even so, no real temporal power returned. He held a diocesan synod in 1356, issued synodal constitutions, completed the city hospital, and died at Volterra on 20 August 1358.