The Monophysite Schism.
THE MONOPHYSITE DIVISION IN THE EARLY GREEK CHURCH:
Monophysite |məˈnɒfɪsʌɪt|
nounChristian Theology
a person who holds that there is only one inseparable nature (partly divine, partly and subordinately human) in the person of Christ.
contrasted with:
In Christian theology, dyophysitism (Greek: δυοφυσιτισμός, from δυο (dyo), meaning "two" and φύσις (physis), meaning "nature") is the Christological position that two natures, divine and human, exist in the person of Jesus Christ.
(this is accepted by most people calling themselves Christians, including Evangelicals, Protestants, Eastern Orthodox, and RC.)
and
Miaphysitism is a Christological formula holding that in the person of Jesus Christ, divine nature and human nature are united (μία, mia – "one" or "unity") in a compound nature ("physis"), the two being united without separation, without mixture, without confusion and without alteration.