Acacians followers of Acacius, Monophthalmus, bishop of Cesarea. In the Council of Seleucia, A.D. 359, they openly professed their agreement with the pure Arians, maintaining, in opposition to the semi-Arians, that the Son was not of the same substance with the Father, and that even the likeness of the Son to the Father was a likeness of will only, and not of essence. Socrat. Eccl. Hist. 3, 25. SEE ACACIUS.