Is the Feast of the Annunciation a feast of Our Lady, of Our Lord, or both?

Is the Feast of the Annunciation a feast of Our Lady, of Our Lord, or both? According to *Fasti Mariani* p. 45 , it's called variously the: - Conception of Christ - Annunciation of Christ - Incarnation of the Lord - Beginning of Redemption - Annunciation of the Angel [Gabriel] to Mary It's called the Conception of Our Lord, in the Byzantine Liturgy .