The Christian doctrine of the Ascension holds that Jesus ascended to heaven in the presence of his Eleven Apostles following his resurrection, and that in heaven he sits at the right hand of God the Father. Belief in the Ascension of Jesus is found in the Nicene Creed, and is affirmed by Christian liturgy and, in the West, by the Apostles' Creed. The Ascension implies Jesus' humanity being taken into heaven. Ascension Day, celebrated 40 days after Easter, is one of chief feasts of the Christian year. The feast dates back at least to the later 300s, as is widely attested.