The title was not even at this time confined to bishops, and who this papa is is quite uncertain.  The title is not generally limited to the bishop of Rome until the eighth century.  So late as 680 Cyrus is called pope of Alexandria at the Sixth Council.  (Mansi xi. 214.)  It was not till 1073 that Gregory VII. asserted an exclusive right to the name.  (Gieseler, vol. 1, 2, 405.)