In Christian theology, the incarnation is the belief that the pre-existent divine person of Jesus Christ, God the Son, the second person of the Trinity, and the eternally begotten Logos (Koine Greek for "word"), took upon human nature and "was made flesh" by being conceived in the womb of a woman, the Virgin Mary, also known as the Theotokos (Greek for "God-bearer" or "Mother of God"). The doctrine of the incarnation then entails that Jesus was at the same time both fully God and fully human—two natures in one person. In the incarnation, as traditionally defined by those Churches that adhere to the Council of Chalcedon, the divine nature of the Son was united but not mixed with human nature in one divine person, Jesus, who was both "truly God and truly man". This is central to the traditional faith held by most Christians. Alternative views on the subject (see Ebionites and the Gospel of the Hebrews) have been proposed throughout the centuries, but all were rejected by Nicene Christianity. The incarnation is commemorated and celebrated each year at Christmas, and reference can also be made to the Feast of the Annunciation; "different aspects of the mystery of the incarnation" are celebrated at Christmas and the Annunciation. Etymology The noun incarnation derives from the ecclesiastical Latin verb incarno, itself derived from the prefix in- and caro, "flesh", meaning "to make into flesh" or, in the passive, "to be made flesh". The verb incarno does not occur in the Latin Bible but the term is drawn from the Gospel of John 1:14 (Vulgate), King James Version: . Description and development of the traditional doctrine Incarnation refers to the act of a pre-existent divine person, the Son of God, in becoming a human being. While all Christians believed that Jesus was indeed the Unigenite Son of God, "the divinity of Christ was a theologically charged topic for the Early Church." Debate on this subject occurred during the first four centuries of Christianity, involving Jewish Christians, Gnostics, followers of Arius of Alexandria, and adherents of Pope Alexander of Alexandria, among others. Ignatius of Antioch taught that "We have also as a Physician the Lord our God, Jesus the Christ, the only-begotten Son and Word, before time began, but who afterwards became also man, of Mary the virgin." Justin Martyr argued that the incarnate Word was pre-figured in Old Testament prophecies. The Catechism of