A.D. 431 · extended material
Council of Ephesus
Is Christ one person, or effectively two persons loosely joined together?
Historical Context
Rival theological schools in Alexandria and Constantinople had developed sharply different ways of describing the union of Christ's divine and human natures.
Controversy
Nestorius's teaching seemed to divide Christ into two separate subjects, which is what provoked the fight over calling Mary "Theotokos," God-bearer.
Confession / Clarification
Ephesus affirmed the title Theotokos, insisting the one born of Mary is, without division, God the Son himself.