became bishop ordinary of Rome in 230 opposite of Hippolytus . In a persecution under Maximinus  Thrax, P. and Hippolytus were exiled to Sardinia in 235, where P. resigned his office on 28 September 235 (MGH AA 9,74 f.) and both died (still in 235?), ending the schism in the church of the city of Rome. P. is buried in the catacombs of St. Callistus in Rome (MGH AA 9,72; burial inscription: ILCV no. 953).
E. Caspar, Geschichte des Papsttums von den Anfängen bis zur Höhe der Weltherrschaft, vol. 1, 1930, 43-50
W. Enßlin, s. v. P. …