Non-Chalcedonian Christianity
Non-Chalcedonian Christianity comprises the branches of Christianity that do not accept and uphold theological resolutions of the Council of Chalcedon, the council following Ephesus, held in 451. Non-Chalcedonian denominations reject the Christological Definition of Chalcedon (which asserted a carefully balanced compromise between Miaphysitism and Dyophysitism), for varying reasons.
Source: Wikipedia — Non-Chalcedonian Christianity (CC BY-SA 4.0)