the Council of Ephesus of 431 to the effect that, in opposition to those who denied Mary the title Theotokos ("the one who gives birth to God") but called her Christotokos ("the one who gives birth to Christ"), Mary is Theotokos because her son Jesus is one person who is both God and man, divine and human. This decree created the Nestorian Schism. Cyril of Alexandria wrote, "I am amazed that there are some who are entirely in doubt as to whether the holy Virgin should be called Theotokos or not. For if our Lord Jesus Christ is God, how is the holy Virgin who gave [Him] birth, not [Theotokos]?" (Epistle 1, to the monks of Egypt; PG 77:13B). But the argument of Nestorius was that divine and human natures of Christ were distinct, and while Mary is evidently the Christotokos (bearer of Christ), it could be misleading to describe her as the "bearer of God". At issue is the interpretation of the Incarnation, and the nature of the hypostatic union of Christ's human and divine natures between Christ's conception and birth. Within the Orthodox doctrinal teaching on the economy of salvation, Mary's identity, role, and status as Theotokos is acknowledged as indispensable. For this reason, it is formally defined as official dogma. The only other Mariological teaching so defined is that of her virginity. Both of these teachings have a bearing on the identity of Jesus Christ. By contrast, certain other Marian beliefs which do not bear directly on the doctrine concerning the person of Jesus (for example, her sinlessness, the circumstances surrounding her conception and birth, her Presentation in the Temple, her continuing virginity following the birth of Jesus, and her death), which are taught and believed by the Orthodox Church (being expressed in the Church's liturgy and patristic writings), are not formally defined by the Church. History of use Early Church The term was certainly in use by the 4th century. Athanasius of Alexandria in 330, Gregory the Theologian in 370, John Chrysostom in 400, and Augustine all used theotokos. Origen (d. 254) is often cited as the earliest author to use theotokos for Mary (Socrates, Ecclesiastical History 7.32 (PG 67, 812 B) citing Origen's Commentary on Romans). Although this testimony is uncertain, the term was used c. 250 by Dionysius of Alexandria, in an epistle to Paul of Samosata. The oldest preserved extant hymn dedicated to