Maundy Thursday April 22 inclusive, but these dates fall on different days depending on whether the Gregorian calendar or Julian calendar is used liturgically. Eastern churches generally use the Julian calendar and celebrate this feast throughout the 21st century between April 1 and May 5 in the more commonly used Gregorian calendar. The liturgy held on the evening of Maundy Thursday initiates the Easter Triduum, the period which commemorates the passion, death, and resurrection of Jesus; this period includes Good Friday and Holy Saturday, and ends on the evening of Easter. The Mass of the Lord's Supper or service of worship is
Holy Week in Braga 313, and the determinations of the Council of Nicaea on the celebration of Easter. The first major testimony of the celebration of Holy week in Jerusalem, and the likely start of his imitation in multiple other places in the Christian world, is the travelogue Peregrinatio ad Loca Sancta or Itinerarium ad Loca Sancta (Pilgrimage / Itinerary to Holy Places) or, simply, Itinerarium Egeriae (Itinerary of Egeria) written by Egeria or Aetheria. This pilgrim was a woman of Gallaecia, probably even of Bracara Augusta (nowadays the city of Braga), that made his own pilgrimage to the Holy Land between 381 and