(Βασιλείος and Βασίλιος), commonly called BASIL.
1. Bishop of ANCYRA (A. D. 336-360), originally a physician, was one of the chief leaders of the Semi-Arian party, and the founder of a sect of Arians which was named after him. He was held in high esteem by the emperor Constantius, and is praised for his piety and learning by Socrates and Sozomen. He was engaged in perpetual controversies both with the orthodox and with the ultra Arians. His chief opponent was Acacius, through whose influence Basil was deposed by the synod of Constantinople (A. D. 360), and banished to Illyricum. He wrote against his predecessor Marcellus, and a work on Virginity. His works are lost. (Hieron. de Vir. Illust. 89 ; Epiphan. Haeres. 73.1; Socrates, H. E. 2.30, 42; Sozomen, H. E. 2.43.)