from Oratory: Place of Prayer (hard copy / PDF download)

Te Deum, also sometimes called the Ambrosian Hymn because if its association with St. Ambrose, is a traditional hymn of joy and thanksgiving. First attributed to Sts. Ambrose, Augustine, or Hilary, it is now accredited to Nicetas, Bishop of Remesiana (4th century). It is used at the conclusion of the Office of the Readings for the Liturgy of the Hours on Sundays outside Lent, daily during the Octaves of Christmas and Easter, and on Solemnities and Feast Days. The petitions at the end were added at a later time and are optional. A partial indulgence is granted to the faithful who recite it in thanksgiving and a plenary indulgence is granted if the hymn is recited publicly on the last day of the year. The Hymn "Holy God We Praise Thy Name" is a translation from the Te Deum.