Lucifer of Cagliari (lōˈsĭfər, kälyäˈrē) [key], d. 370, bishop of Cagliari, Sardinia (353–70), violent opponent of Arianism. As legate of Pope Liberius he went to the council at Milan (355) that Constantius disbanded by exiling the Catholic delegates. Lucifer was bitter against those who seemed to submit to Arianism, and on his return to Sardinia (362) he formed a sect of his own, barring all who had strayed into Arianism at all. His peremptory consecration of a bishop for Antioch (outside his jurisdiction) perpetuated the schism of Meletius.
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