is the study of all that pertains to Christ. Several dogmas were discussed throughout the history of the Church by the leaders and theologians of the Church concerning the nature of Christ; whether he is God or merely became a son by adoption (Bishop Paul of Samosata). The divine nature was discussed during the Arian crisis in the fourth century and especially at the Councils of Nicaea and Constantinople.

The nature of and the relation between this and humanity in were discussed at the Councils of Ephesus and Chalcedon. After the Council of Chalcedon, several theological debates and works defending or opposing the definitions of this council appeared. Notable among these are the works of Severus of .