Peter, Count of Ribagorza

Peter of Aragon and Anjou (1305 – 4 November 1381), son of James II and Blanche of Anjou, was an infante of Aragon who served three kings as soldier, diplomat and counsellor. He was Count of Ribagorza from 1322.

In 1343 he joined Peter IV's Majorca expedition. He was chief counsellor of Alfonso IV and Peter IV, and regent during Peter IV's absence in 1354–1356. In 1358 he gave up his counties and entered the Franciscans, advocating an end to the Avignon papacy in a prophetic tract.

His son Alfonso became duke of Gandia, John was a candidate for the Aragonese crown before the Compromise of Caspe, and James rose to cardinal. Peter died at Pisa in 1381.