Pope Gregory XII
On being created cardinal by Pope Innocent VII (1404–1406) in 1405, he devoted all his energies to the reunion of the Church, in spite of the two rival popes. He was one of the promoters of the Council of Pisa and his political maneuvers incurred the displeasure of Pope Gregory XII (1406–1415), who ordered Philarges deprived of both his dignities as archbishop and cardinal.