Peter III of Gruyères

Peter III of Gruyères (1279–1342), grandson of Count Peter II, was the younger son of Peter the Younger. He first assisted his grandfather as lord of Gruyères before succeeding as count, when he left the lordships of Montsalvens and Le Vanel to his nephews. In 1307 he and his wife founded the Part-Dieu Charterhouse.

He added Les Ormonts and several castles to his domains, became avoyer of Fribourg in 1330, and promoted cattle trading and cheese production. He died late in 1342 and was buried at Part-Dieu.