Louis Marie Olivier Duchesne, 1911 Encyclopædia Britannica, Volume 7… (1911)
“ When, however, the emperor Constantius sent to Rome an anti-pope in the person of Felix II., Damasus, with the other clergy, rallied to his cause. When Liberius returned from exile and Felix was expelled from Rome, Damasus again took his place among the adherents of Liberius. On the death of Liberius (366) a considerable party nominated Damasus successor; but the irreconcilables of the party of Liberius refused to pardon his trimming, and set up against him another deacon, Ursinus. A serious conflict ensued between the rival factions, which quickly led to rioting and hand-to-hand fighting. ”
