Primo die, quo Trinitas; Hail Day! Whereon the One in Three

Hymn for Matins from the Octave of the Epiphany until the first Sunday of Lent, and from the Sunday nearest 1 October until Advent. It was written by Saint Gregory the Great, and has about 20 translations; the English title given is by J. Neale and others.

New Catholic Dictionary

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