"The Twelfth Night (Epiphany) also marks a visit to the baby Jesus by The Magi, (the three Kings, or Wise Men). The word 'Epiphany' comes from Greek and means 'manifestation'. It celebrates 'the revelation of God in his Son as human in Jesus Christ'...."
http://www.telegraph.co.uk/news/2016/11/18/what-is-the-epiphany-and-when-in-2017-is-it-here-are-10-facts-ab/