"St. John the Baptist with Saints"
by Cima da Conegliano (1491-92 A.D.)
*The History of Advent
"The name Advent (which from the Latin word Adventus, signifies a Coming) is applied, in the Latin Church, to that period of the year, during which the Church requires the faithful to prepare for the celebration of the Feast of Christmas, the anniversary of the Birth of Jesus Christ. The mystery of that great day had every right to the honour of being prepared for by prayer and works of penance... ." [...]
"The Church also, during Advent, excepting on the Feasts of Saints, suppresses the Angelic Canticle, Gloria in excelsis Deo, et in terra pax hominibus bonӕ voluntatis; for this glorious Song was only sung at Bethlehem over the crib of the Divine Babe;—the tongue of the Angels is not loosened yet;—the Virgin has not yet brought forth her divine treasure;—it is not yet time to sing... ." Note: to read/learn more about The History of Advent CLICK HERE.
*(Source: "The Liturgical Year - Advent", By The Very Rev. Dom Prosper Guéranger, Edition 1870 A.D.)