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Chalcedon
The Fourth Ecumenical Council (451 AD) — defined Christ as one Person in two natures with four precise adverbs.
Chalcedon defined that Jesus Christ is one hypostasis in two natures — divine and human — united without confusion, without change, without division, without separation. The four adverbs address both Eutychianism (which merged the natures) and Nestorianism (which divided them). A minority of Eastern Christians (Oriental Orthodox) rejected it; modern ecumenical dialogue has largely concluded the disagreement is terminological rather than substantive.