Epiphany (Koine Greek: Ἐπιφάνεια, Epiphaneia, "Manifestation", "striking appearance") or Theophany (Ancient Greek: (ἡ) Θεοφάνεια, Τheophaneia meaning "Vision of God"), also known as Three Kings' Day, is a Christian feast day that celebrates the revelation of God in his Son as human in Jesus Christ. In Western Christianity, the feast commemorates principally (but not solely) the visit of the Magi to the Christ child, and thus Jesus' physical manifestation to the Gentiles. Moreover, the feast of the Epiphany, in some Western Christian denominations, also initiates the liturgical season of Epiphanytide. Eastern Christians, on the other hand, commemorate the baptism of Jesus in the Jordan River, seen as his manifestation to the world as the Son of God.