[[Christology ]] controversies centered over the manner of union between Godhead and Manhood in Christ. The era of these controversies extended over the period from the fourth through sixth centuries and involved disputes between factions on defining, that is expressing in words, the manner of the union of the two conditions of Christ: the divine and the human. In the language of the day these arguments involved the expression of exact combinations of the semantic variables: ousia, physis, hypostasis, prosopon. The Cyril/Nestorius arguments were one of the battlegrounds during this interval of time. The dispute between Cyril and Nestorius was heightened by their use of same words differently. Nestorius used the words in a rigid manner, not recognizing recent changes in their meaning and usage, and failing to recognize the context that Cyril used. While Nestorious argued from a rigid semantical position and noted Cyril's inconsistent usage, Cyril felt Nestorious was advocating a ''two son'' definition as implied in Nestorius' adamant use of the title ''Mother of Christ''. In the event, Cyril's arguments would prevail in the later councils, but Nestorious' banishment would also result in the split in the Church as a heretical group called Nestorians would form, centered in Persia.

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* [[John A. Anthony McGuckin]], (2004), ‘‘St''St. Cyril of Alexandria and the Christological Controversy'', St. Vladimir's Seminary Press, Crestwood, New York ISBN 0-88141-259-7