Catechism of the Catholic Church §528 — excerpt
The Epiphany is the manifestation of Jesus as Messiah of Israel, Son of God and Saviour of the world. the great feast of Epiphany celebrates the adoration of Jesus by the wise men (magi) from the East, together with his baptism in the Jordan and the wedding feast at Cana in Galilee.
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.
Whole chapters cited: John 4
Also cites: LH, Epiphany, Evening Prayer II, Antiphon at the Canticle of Mary · St. Leo the Great, Sermo 3 in epiphania Domini 1-3, 5: PL 54, 242 · LH, Epiphany, OR · Roman Missal, Easter Vigil 26, Prayer after the third reading