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.

The Annunciation is, according to the Gospel of Luke, the announcement by the archangel Gabriel to Mary that she would conceive and bear a son through a virgin birth and become the mother of Jesus Christ, the Christian Messiah and Son of God, marking the Incarnation. Gabriel told Mary to name her son Jesus.