Quem terra, pontus, sidera

"Quem terra, pontus, sidera" is an ancient hymn in honour of the Blessed Virgin, ascribed and described to Fortunatus. The Roman Breviary divides it into two parts: the first, beginning with "Quem terra, pontus, sidera", assigned to Matins; the second, beginning with "O gloriosa virginum", similarly assigned to Lauds. Both parts conclude with the doxology of Marian hymns, "Jesu tibi siti glorria etc." As found thus, the hymns are revisions, in the interest of classical prosody, of the older hymn, "Quem terra, pontus, æthera", found in many old breviaries, and in manuscripts dating from the eighth century. In the Cistercian office it was sung officially at Compline during Advent. Sometimes it was divided into two parts, as now in the Roman Breviary, the second part beginning with "O gloriosa Domina" (or "femina").----