Nestorianism derives from the works of Nestorius, and also by other sources that are related to his teachings in the fields of Mariology and Christology. Nestorian Mariology rejects the title Theotokos (“God-bearer”) for Mary, thus emphasizing distinction between divine and human aspects of the Incarnation of Christ. Nestorian Christology promotes the concept of a prosopic union of two natures (divine and human) in Jesus Christ.