"The appellation θεοτόκος was not at all universal. After the Council of Ephesus, it still had to be explained to the occidentals. . . . Before 428, it is not in fact encountered [(ne se rencontre pratiquement pas)] in the literary œuvre of Cyril, though it is found in at least one homily of Nestorius; . . . the Alexandrian archbishop will continue, at the height of the controversy, to call [(conservera, en pleine controverse, l’usage d’appeler)] Mary 'the Holy Virgin'."
Joseph Famerée, "Éphèse et Nestorius: un malentendu christologique: l’apport du P. A. de Halleux," Revue théologique de Louvain 39, no. 1 (2008): 16-17 (3-25).