The Tridentine Calendar is the calendar of saints to be honoured in the course of the liturgical year in the official liturgy of the Roman Rite as reformed by Pope Pius V, implementing a decision of the Council of Trent, which entrusted the task to the Pope. The text of the Tridentine Calendar can be found in the original editions of the Tridentine Roman Breviary and of the Tridentine Roman Missal.