Alma Redemptoris Mater (Ecclesiastical Latin: [ˈalma redɛmpˈtoris ˈmatɛr]; English: Loving Mother of our Saviour) is a Marian hymn, written in Latin hexameter, and one of four seasonal liturgical Marian antiphons sung at the end of the office of Compline (the other three being Ave Regina cælorum, the Regina cœli and the Salve Regina). Hermannus Contractus (also called Herman the Cripple; 1013–1054) is said to have authored the hymn based on the writings of Saints Fulgentius, Epiphanius, and Irenaeus of Lyon. It is mentioned in The Prioress's Tale, one of Geoffrey Chaucer's Canterbury Tales. Formerly it was recited at compline only from the first Sunday inAdvent until the Feast of the Purification (2 February).
Depending on the period, the following combinations of a versicle, response, and collect are added. From the first Sunday of Advent until Christmas Eve, the collect from the Fourth Sunday of Advent is used, and thereafter until the Feast of the Presentation, the collect from Solemnity of Mary, Mother of God, is used.