it was there that the Virgin Mother was declared to be θεοτόκος, the Mother of God — five days before the delegates from Antioch arrived. Nestorius had refused to attend. He was condemned and deprived of his see.
Campbell argues that the Council of Ephesus condemned Nestorius and proclaimed Mary Theotokos under the archetypal influence of the ancient goddess Artemis whose chief temple site Ephesus had long been, implying that unconscious mythological forces shaped the doctrinal outcome.
, Occidental Mythology: The Masks of God, Volume III, 1964thesis