CARM Theological Dictionary
Monarchianism (mono - "one"; arche - "rule") was an error concerning the nature of God that developed in the second century A.D. It arose as an attempt to maintain Monotheism and refute tritheism. Unfortunately, it also contradicts the orthodox doctrine of the Trinity. Monarchianism teaches that there is one God as one person: the Father. Please see Heresies for more information.
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Entry for 'Monarchianism'. CARM Theological Dictionary. https://www.studylight.org/dictionaries/eng/ctd/m/monarchianism.html. 2013.