In Christian theology, the doctrine of incarnation teaches that the pre-existent divine person of Jesus Christ, God the Son, the second person of the Trinity, and the eternally begotten Logos, 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. The doctrine of the incarnation then entails that Jesus was at the same time both fully God and fully human.

The Feast of the Annunciation commemorates the visit of the archangel Gabriel to the Virgin Mary, during which he informed her that she would be the mother of Jesus Christ, the Son of God. It is celebrated on 25 March; however, if 25 March falls either in Holy Week or in Easter Week, the feast is postponed to the Monday after the Second Sunday of Easter.