ACACIUS, a-kā′shius, bishop of Cæsarea 340–365 a.d. He founded a curious Christian sect called the Acacians, and that may be termed homoiothelites, as they held that the Son was like the Father in will, but not of the same or similar substance; thus differing from the Arians. He induced a synod at Constantinople in 359 to accept the doctrine, whereon St. Jerome said that “the world groaned and wondered to fin itself Arian.” It was finally condemned, however, and he was banished.