Marcellus of Ancyra
Marcellus of Ancyra (died c. 374 C.E.) was one of the bishops present at the Councils of Ancyra and of Nicaea. He was a strong opponent of Arianism, but was accused of adopting the opposite extreme of modified Sabellianism. He was condemned by a council of his enemies and expelled from his see, though he was able to return there to live quietly with a small congregation in the last years of his life.
History
A few years after the Council of Nicaea (in 325) Marcellus wrote a book against Asterius the Sophist, a prominent figure in the party which supported Arius. In this work (only fragments of which survive), he was accused of maintaining that the Trinity of persons in the Godhead was but a transitory dispensation. According to the surviving fragments, God was originally only One Being (hypostasis), but at the creation of the universe the Word or Logos went out from the Father and was God's Activity in the world. This Logos became incarnate in Christ and was thus constituted Image of God. The Holy Ghost likewise went forth as third Divine Personality from the Father and from Christ according to John 20:22. At the consummation of all things, however (I Corinthians 15:28), Christ will return to the Father and the Godhead be again an absolute Unity.