The Triduum Sacrum refers to the three Holy Days of Maundy Thursday, Good Friday and Holy Saturday.  In origin, the services which mark these Holy Days go back to the early centuries of the Christian religion.

Maundy Thursday is concerned with the Institution of the Eucharist by Our Blessed Lord in the Upper Room and with his agony in the Garden of Gethsemane.  The Liturgy on Good Friday is pre-occupied with the Crucifixion of the Saviour.  The Easter Vigil on Holy Saturday celebrates his Resurrection and our own sharing of his risen life through our membership of his Church.

By these three services the Church not only commemorates these events but also herself in every generation enters into their meaning.