This great hymn of the Church is said to have been written by Saints Ambrose and Augustine together, though it has also been attributed to Bishop Niceta of Dacia; in either case its origins are in the late 4th or early 5th centuries. By the 6th century it had found its home in the Daily Office, in Matins (Benedictine) or Prime (Mozaribic). A set of suffrages were affixed to the Te Deum in medieval practice, which Archbishop Cranmer retained in the first Prayer Books.
The Prayer Book tradition has consistently appointed this canticle as the one following the Old Testament Lesson at Morning Prayer, usually with seasonal exceptions. Its precise translation has varied in most editions of the Prayer Book, making for a number of useful comparative-study opportunities for exploring its meaning more deeply.
In 1979 the medieval suffrages were removed from the Te Deum and placed elsewhere in the Morning Prayer liturgy, but the 2019 Book has placed them back in the traditional Prayer Book position, albeit rendering them optional.