For me, there is a little confusion surrounding the Assyrian Church of the East and the Oriental Orthodox Christians.
So, basically my original understanding was…
In 431 AD, The Council of Ephesus was established as the third ecumenical council. One of the doctrines condemned by this council was Nestorianism. Nestorians objected to the title of Mary as the “Theotokos” (Mother of God) because of their belief that Jesus’ two natures, human and divine, were completely seperate and that when God came as Jesus, He was either God or man, but never at the same time. The Assyrian Church of the East were Nestorians and thus broke away.
In 451 AD, The Council of Chalcedon was established as the fourth ecumenical council. One of the doctrines condemned by this council was Monophysitism which teaches that Jesus had one nature, a mix of human and divine, rather than two. Certain Eastern bishops held to this doctrine broke away and these became Oriental Orthodoxy. ********
If this is inaccurate, what was the reason why did the Assyrian Church of the East and Oriental Orthodox Christians not accept these councils?
Also, what’s the difference between Miaphysites, Monophysites, and general/mainstream Christian understanding of the nature(s) of Christ?