Born about 1305 in southern Perigord in France, Peter Thomas entered the Carmelites when he was
twenty-one. He was chosen by the Order as its procurator general to the Papal Court at Avignon in 1345. After being made bishop of Patti and Lipari in 1354, he was entrusted with many papal missions to promote peace
and unity with the Eastern Churches. He was translated to the see of Corone in the Peloponnesus in 1359 and made Papal Legate for the East. In 1363 he was appointed Archbishop of Crete and 1364 Latin Patriarch of
Constantinople. He won a reputation as an apostle of church unity before he died at Famagosta on Cyprus in 1366.