Editing Gloria in excelsis Deo (section)

===Roman Rite===
By contrast, in the [[Roman Rite]] this hymn is not included in the [[Liturgy of the Hours]], but is sung or recited at [[Mass (liturgy)|Mass]], after the [[Kyrie]], on Sundays outside of [[Lent]] and [[Advent]], during the [[octave (liturgy)|octaves]] of Easter and Christmas, and on [[solemnity|solemnities]] and feasts.<ref name=ODCC/>

In Masses celebrated in accordance with the 1962 [[Roman Missal]] (authorized as an [[Summorum Pontificum|extraordinary form]] of the Roman Rite), the Gloria is sung much more frequently: the 1960 [[Code of Rubrics]] require it at Mass when in the corresponding Office of the day the [[Te Deum]] is said at [[Matins]]. It is thus used not only on I and II-class feasts (corresponding to solemnities and  feasts in the [[Mass of Paul VI|post-Vatican II Mass]]) but also on III-class feasts (corresponding to [[memorial (liturgy)|memorials]] in the later form). In the 1962 form it is also said on ferias of [[Christmastide]] and [[Paschaltide]] even outside the octaves, but is omitted during the [[Septuagesima]] season, which does not exist in the post-Vatican II liturgy. The Gloria is also sung in both the pre-Vatican II and in the later form of the Roman Rite at the [[Mass of the Lord's Supper]] in the evening of [[Maundy Thursday]] and at the [[Easter Vigil]].<ref>{{cite book|editor-last1=Murphy|editor-first1=Patrick L. |title=The New Rubrics of the Roman Breviary and Missal|date=1960|publisher=Catholic Press Newspaper Co.|location=Surrey Hills, New South Wales, Australia|page=81}}</ref>

A tradition recorded in the [[Liber Pontificalis]] attributes to [[Pope Telesphorus]] (128–139?) the use of the hymn at the Mass of [[Christmas Day]] and to [[Pope Symmachus]] (498–514) its use on Sundays and the feasts of [[martyr]]s, but only by bishops; the right to use it was later extended to priests, at first only at [[Easter]] and on the day of their ordination, but by the end of the 11th century priests, as well as bishops, used it in the Mass on Sundays and feasts outside of Lent and [[Septuagesima|Pre-Lent]]. After the 12th century [[Advent]] began to be considered a penitential period in imitation of [[Lent]], to the exclusion therefore of the {{lang|la|Gloria in excelsis Deo}}.<ref name=CE/>