Ranieri Belforti

Ranieri Belforti (c. 1278–1320) was bishop of Volterra from a Guelph noble family, son of Belforte and brother of Ottaviano, the city's future lord. A cathedral canon, he was made bishop by Pope Boniface VIII on 22 December 1301 and consecrated the following January. He worked to rebuild the diocese's estates, bargained with the commune and Florence, and in 1305 became counselor to Robert of Anjou to settle diocesan debts, leaving a vicar to administer the diocese for three years.

Opposing Emperor Henry VII of Luxembourg, he lost his imperial fiefs. In 1319 factional strife drove the Belforti into exile, and he died in Florence on 26 November 1320.