In the Catholic Church, on this day the private celebration of Mass is forbidden. Thus, apart from the Chrism Mass for the blessing of the Holy Oils that the diocesan bishop may celebrate on the morning of Holy Thursday, but also on some other day close to Easter, the only Mass on this day is the evening Mass of the Lord's Supper, which inaugurates the period of three days, known as the Easter Triduum, that includes Good Friday (seen as beginning with the liturgy of the preceding evening), Holy Saturday and Easter Sunday up to evening prayer on that day. The Chrism Mass, whose texts the Roman Missal as well as the rubrics used in the Lutheran Churches now gives under Maundy Thursday, but before the Paschal Triduum, which begins that evening, may be brought forward early in Holy Week, to facilitate participation by as many as possible of the clergy of the diocese together with the bishop. This Mass was not included in editions of the Roman Missal before the time of Pope Pius XII. In this Mass, the bishop blesses separate oils for the sick (used in Anointing of the Sick), for catechumens (used in Baptism) and chrism (used in Baptism, but especially in Confirmation and Holy Orders, as well as in rites such as the dedication of an altar and a church).