O Lux Beata Trinitas

This hymn is used for Vespers on Saturdays (I Vespers Sunday) throughout the year in the Extraordinary Form of the Roman Breviary. It is used for Vespers on Sundays of Weeks II & IV during Ordinary Time in the Ordinary Form. It is also used for Vespers on Trinity Sunday. It is also used for Vespers on Saturdays (I Vespers Sunday) on weeks after Pentecost in the Sarum Breviary.

O Lux beata Trinitas
Et principalis Unitas,
Iam sol recedit igneus:
Infunde lumen cordibus.

Te mane laudum carmine,
Te deprecemur vespere;
Te nostra supplex gloria
Per cuncta laudet sæcula.

*Deo Patri sit gloria,
Eiusque soli Filio,
Cum Spiritu Paraclito,
Et nunc, et in perpetuum. Amen.

Words: Attr. St. Ambrose**, 4th C.
Tune: “O Lux Beata Trinitas” Gregorian Chant, Tone VIII, traditional.
Meter: 88.88

*This closing doxology is included in the 1531 Folio edition of the Sarum Breviary but is omitted from the The Hymnale Secundum Usum Insignis Ac Praeclarae Ecclesiae Sarisburiensis (1850).
*This closing doxology is replaced with the following in the Liber Hymnarius:

Christum rogamus et Patrem,
Christi Patrisque Spiritum;
Unum potens per omnia,
Fove precantes, Trinitas. Amen.


**The Liber Hymnarius records an anonymous authorship dated to the 7th or 8th C.

The hymn takes the following form in Pope Urban VIII’s 1632 reform of the Breviary:

Iam sol recedit igneus:
Tu lux perennis Unitas,
Nostris, beata Trinitas,
Infunde lumen cordibus.

Te mane laudum carmine,
Te deprecamur vespere;
Digneris ut te supplices
Laudemus inter cælites.

Patri, simulque Filio,
Tibique sancte Spiritus,
Sicut fuit, sit iugiter
Sæculum per omne gloria. Amen.

This text has been translated into English as the following:
Now Doth the Fiery Sun Decline
O Trinity Of Blessèd Light (O Trinity, Most Blessèd Light)

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About Noah

musings of a young Catholic aspiring to be faithful to his Lord and God Jesus Christ through His Holy Catholic Church
This entry was posted in Ancient & Mediaeval Hymns, Authorship Debated, Unknown, To Be Determined, Breviaries, Days of the Week, Evening Prayer / Vespers, Hymns By The Greats, Latin Hymns, Major Feasts, Non-English Hymns, Offices of the Breviary, Ordinary Time, Roman Breviary, Sabbath/Saturday, Saints of the Church (Canonized or Beatified), Sarum Breviary, St. Ambrose, Sunday, The Church Year, The Holy Trinity, The Liturgy of Hours/Breviary, The Liturgy of the Church, Trinity Sunday (Sunday after Pentecost), Weeks After Epiphany (EF), Weeks after Pentecost (EF). Bookmark the permalink.

2 Responses to O Lux Beata Trinitas

  1. Pingback: Now Doth The Fiery Sun Decline | Saint Augustine's Lyre

  2. Pingback: O Trinity, Of Blessèd Light | Saint Augustine's Lyre

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