Nestorianism is a based on what is called "Dyophysitism", which is the Christian belief that Jesus Christ was God and human, having two natures in what is called the [[hypostatic union]]. Nestorianism can be described as the belief that Jesus was having loosely two natures, and did not believe in the hypostatic union, but rather more in a [[prosopic union]]. The belief traces its roots to [[Nestorius]], the Archbishop or [[Patriatch of Constantinople]]. He rejected the idea of the idea of "Theotokos", that Mary, the mother of Jesus, was the mother of God. Instead, he encouraged the term "Cristokos" or "Christ-bearer". His beliefs were rejected by the [[Council of Ephesus]] in 431. However, his beliefs were accepted by the [[Church of the East]].