Anno Domini

Definition and stakes

K. A. Heinrich Kellner,  Heortology (1908)

“ The want of uniformity in the duration of Advent in different parts of the Church is due to the fact that local Churches, conformably to the ancient discipline, acted independently of each other. Thus, in Rome Advent lasted only four weeks, as we gather from the Gregorian sacramentary, which provides three Sundays in December with collects de adventu Domini, and a dominica vacans; [160] in the Appendix, however, five Sundays are reckoned before Christmas. ”
Source: Gutenberg

K. A. Heinrich Kellner,  Heortology (1908)

“ It took longer to make its way in France, although the way had already been prepared for it by Perpetuus of Tours. The service-books of the seventh century, the Lectionary of Luxeuil, and the so-called Missale Gothico-Gallicanum, edited by Mabillon, commence with the Vigilia Natalis Domini, without Advent. In Rome, the institution of Advent cannot be traced further back than to the sixth century, for the sermons of St Augustine and Leo I. make no mention of it. Unmistakable evidence for its observance is found for the first time in the homilies of Gregory the Great. ”
Source: Gutenberg

K. A. Heinrich Kellner,  Heortology (1908)

“ So long as our Lord’s birth was commemorated at Epiphany on the 6th January, the 15th February was the fortieth day after the Nativity, and so, as a matter of fact, the festival of the Occursus Domini was celebrated in Jerusalem on this day in 385. [350] But when the Nativity came to be celebrated on the 25th December, the other festival had to [158] be placed thirteen days earlier, on the 2nd February, as it is at the present time. [351]
2. Advent and the Sundays until Septuagesima
Christmas, like Easter, besides its Vigil and Octave, has also a considerable period of preparation.
”
Source: Gutenberg

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