Felix

Felix, the name of five Popes: F. I., St., Pope from 269 to 274, said to have been a victim of the persecution of Aurelius; F. II., Pope from 356 to 357, the first anti-pope having been elected in place of the deposed Liberius who had declined to join in the persecution of Athanasius (q.v.), was banished on the restoration of Liberius; F. III., Pope from 483 to 492, during his term of office the first schism between the Eastern and Western Churches took place; F. IV., Pope from 526 to 530, was appointed by Theodoric in face of the determined opposition of both people and clergy; F. V., Pope from 1439 to 1449. See Amadeus VIII..

Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)