Lucifer, bishop of Cagliari, died about 370. In 354 he was sent by Liberius, bishop of Rome, as legate to the council of Milan, to uphold, in conjunction with Eusebius of Ver-celli, the cause of the Catholic church against the Arian emperor Constantius. In consequence of the firmness with which he withstood the wishes of Constantius, he was arrested, and carried from place to place as an exile. While residing at Eleutheropolis in Palestine he composed his principal work, Ad Constantium Augustum pro Sancto Athanasio. On the death of Constantius Lucifer was restored to freedom, and commissioned by the council of Alexandria to aid in healing the disorders which afflicted the church of Antioch in consequence of the supposed Arianism of Meletius its bishop. His violence, however, only increased those disorders, and exposed him to the censure of his best friends. Chafing under the rebuke, and disgusted with the moderation of his party, he retired in 363 to his native island of Sardinia, and there founded a small sect, known as Luciferiani, whose most distinguishing characteristic was inveterate hostility to Arianism. The first edition of his works appeared at Paris in 1568; the best is that of the brothers Coleti (Venice, 1778).