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An archdeacon, he was elected by the minor clergy in opposition to Boniface I after the death of Pope Zosimus. Both claimants proceeded to rule in Rome. The Eulalian Prefect of Rome secured the imperial confirmation for the antipope, but the adherents of Boniface secured a hearing before Emperor Honorius, who summoned a synod at Ravenna, 419, to settle the claims. Pope and antipope were exiled until the synod had come to a decision. Eulalius declined to abide by the ruling and seized the Lateran Basilica. Honorius refused to consider his claim at all and recognized Boniface as the legitimate pontiff. Eulalius was later made Bishop of Nepi. He died in 423.

 

New Catholic Dictionary