The Epiphany of the Lord
The word "Epihany" comes from the Greek word epiphanein, which means a showing, or a manifestation.
The Feastday of the Epiphany refers to the visit to the baby Jesus by the three wise men (the "Magi"). It is supposed to be 12 days after Christmas, ("twelfth night") but is celebrated on January 6th., or else the first Sunday after 1st.January.
Prior to the fourth century both Christ's Birthday and his epiphany, or manifestation as Saviour of all races and nations, were celebrated on the same day, but since the fourth century they were separated, so that we celebrate his Birthday on December 25, and His epiphany on January 6.