Oriental Orthodoxy refers to a branch of Christianity that split from the Eastern Orthodox Church after the Council of Chalcedon in 451 AD. This tradition is characterized by its adherence to Miaphysitism, which emphasizes the unified nature of Christ, rejecting the Chalcedonian definition that asserted two natures in Christ. Oriental Orthodox churches include the Coptic, Ethiopian, Armenian, and Syrian Orthodox Churches, each with their own rich theological and liturgical traditions.