This article discusses the Second Council of Constantinople, whose purpose was to try and reconcile those who agreed with Chalcedon with the Monophysites. The article presents the Council's setting, purpose, and major characters, as well the nature and result of the conflict.

Looking at the Council of Chalcedon, this article shows how this council was able to clarify the Apollinarianism, Nestorianism, and the Eutychianism in the controversy on the human and divine nature of Christ. Though these heresies dated before Chalcedon, the author shows that heresy is necessary as it helps to advance orthodoxy.