Monophyite ("one-nature") Christians believed that Christ had only one "Nature". The Council of Chalcedon (pronounced kal-SEE-don or KAL-seh-don) in AD 451 ruled that, after the incarnation, Jesus had two natures, human and divine. The Western Churches generally accepted the Chalcedonian formula, but the Churches in Egypt and the East generally rejected it.

Mar Thoma Christians are still active in today's world. There are Mar Thoma Christians living in Clovis, NM, and a Mar Thoma Church in Lubbock, TX.