1910 New Catholic Dictionary
O Trinity of Blessed Light
Hymn for Vespers on Trinity Sunday. This is the original text of the hymn; the Roman Breviary text is "Jam sol recedit igneus". The hymn was written by Saint .Ambrose (340-397). There are 12 translations of the original text; the title given above is by J. Neale.
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Entry for 'O Trinity of Blessed Light'. 1910 New Catholic Dictionary. https://www.studylight.org/dictionaries/eng/ncd/o/o-trinity-of-blessed-light.html. 1910.