Easter Triuum, Holy Triduum, or Paschal Triduum is a term used by some Christian churches, particularly the Roman Catholic Church, the Lutheran Church, and many Anglicans, to denote, collectively, the three days from the evening of Holy Thursday (or Maundy Thursday) to the evening of Easter Sunday. The Triduum begins with the evening Mass of the Lord's Supper (or, where this is not celebrated, Vespers of Holy Thursday) and ends after Vespers at sunset on Easter Day.