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Authorship and date of composition uncertain. It has been in use since the twelfth century. Meter: Trochaic dimeter. Translation by Father Caswall. There are at least four additional translations. Liturgical Use: Antiphon proper to the season after the Purification, that is, from the end of Compline of Feb. 2nd (even should the Feast of the Purification be transferred) until Maundy Thursday, exclusive.
Radix: “root of Jesse,” i.e., an offshoot from the root of Jesse; a descendant of Jesse, the father of David. The Blessed Virgin was of the House of David; Jesse therefore was one of her ancestors. Mary is a root of Jesse, but her Divine Son is the root of Jesse (cf. Is. 11, 1; Rom. 15, 12).