It so happened that Nestor, the Bishop of Antioch, who entertained the philosophical views of Theodore of Mopsuestia, had been called by the Emperor Theodosius the Younger to the Episcopate of Constantinople (A.D.

427).

Nestor rejected the base popular anthropomorphism, looking upon it as little better than blasphemous, and pictured to himself an awful eternal Divinity, who pervaded the universe, and had none of the aspects or attributes of man.

Nestor was deeply imbued with the doctrines of Aristotle, and attempted to coordinate them with what he considered to be orthodox Christian tenets.
Between him and Cyril, the Bishop or Patriarch of Alexandria, a quarrel accordingly arose.

Cyril represented the paganizing, Nestor the philosophizing party of the Church.