Arian theologian. He succeeded Eusebius in the see of Caesarea (in Palestine) in 341, but was pronounced deposed by the Council of Sardica (343). In 359 he proposed a Homoean Creed at the Council of Seleucia. He signed the Creed of Nicaea in 363 but returned to Arianism and was deposed in 365. His followers (‘Acacians’) were a distinct and important theological party between 357 and 361.