Epiphany, as observed in the Christian Church, is a festival held on the 12th day after Christmas, in commemoration of the manifestation of Christ to the Magi of the East; but up to the close of the 4th century the festival also commemorated the incarnation of Christ as well as the divine manifestation at His baptism.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Epiphanius, St. * Epi`rus