Quem terra, pontus, sidera

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"Quem terra, pontus, sidera", also known by its more ancient name, "Quem terra, pontus, aethera", is a latin-language Christian hymn in long metre, in honour of the virgin Mary, mother of Jesus, attributed to Venantius Fortunatus.

The Roman

Cistercian office it was sung officially at Compline during Advent. Sometimes it was divided into two parts, as in the Roman Breviary
, the second part beginning with "O gloriosa Domina" (or "femina").

References

 This article incorporates text from a publication now in the public domainHerbermann, Charles, ed. (1913). "Quem terra, pontus, sidera". Catholic Encyclopedia. New York: Robert Appleton Company.