FELIX II., antipope, was in 356 raised from the archdeaconate of Rome to the papal chair, when Liberius was banished by the emperor Constantius for refusing to condemn Athanasius. In 357 Constantius agreed to the release of Liberius on condition that he signed the semi-Arian creed. Constantius also issued an edict to the effect that the two bishops should rule conjointly, but Liberius was received with so much enthusiasm that Felix found it necessary to retire. He appears to have retired to Porto where he died in 365. See Liber Pontificalis t.I.