The Alma Redemptoris Mater
Sung from the first Sunday of Advent until the Feast of the Purification on February 2 (the original ending date of the Christmas season), this prayer tells of Gabriel’s announcement, and of Mary’s divine motherhood.
Alma Redemptoris Mater, quae pervia caeli porta manes et stella maris, succurre cadenti, surgere qui curat, populo: tu quae genuisti, natura mirante, tuum sanctum genitorem, Virgo prius, ac posterius, Gabrielis ab ore sumens illud ave, peccatorum miserere.
This translation is by the Reverend Adrian Fortescue, 1913:
Holy mother of our Redeemer, thou gate leading to heaven and star of the sea; help the falling people who seek to rise, thou who, all nature wondering, didst give birth to thy holy Creator. Virgin always, hearing the greeting from Gabriel’s lips, take pity on sinners.