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The Catholic Encyclopedia
Feast of the Expectation of the Blessed Virgin Mary
(Exspectatio Partus B.V.M.)
Celebrated on 18 December by nearly the entire Latin Church. Owing to the ancient law of the Church prohibiting the celebration of feasts during Lent (a law still in vigour at Milan), the Spanish Church transferred the feast of the Annunciation from 25 March to the season of Advent, the Tenth Council of Toledo (656) assigning it definitely to 18 December. It was kept with a solemn octave. When the Latin Church ceased to observe the ancient custom regarding feasts in Lent, the Annunciation came to be celebrated twice in Spain, viz. 25 March and 18 December, in the calendars of both the Mozarabic and the Roman Rite (Missale Gothicum, ed. Migne, pp. 170, 734). The feast of 18 December was commonly called, even in the liturgical books, "S. Maria de la O", because on that day the clerics in the choir after Vespers used to utter a loud and protracted "O", to express the longing of the universe for the coming of the Redeemer (Tamayo, Mart. Hisp., VI, 485). The Roman "O" antiphons have nothing to do with this term, because they are unknown in the Mozarabic Rite. This feast and its octave were very popular in Spain, where the people still call it "Nuestra Señora de la O". It is not known at what time the term Expectatio Partus first appeared; it is not found in the Mozarabic liturgical books. St. Ildephonsus cannot, therefore, have invented it, as some have maintained. The feast was always kept in Spain and was approved for Toledo in 1573 by Gregory XIII as a double major, without an octave. The church of Toledo has the privilege (approved 29 April 1634) of celebrating this feast even when it occurs on the fourth Sunday of Advent. The "Expectatio Partus" spread from Spain to other countries; in 1695 it was granted to Venice and Toulouse, in 1702 to the Cistercians, in 1713 to Tuscany, in 1725 to the Papal States. The Office in the Mozarabic Breviary is exceedingly beautiful; it assigns special antiphons for every day of the octave. At Milan the feast of the Annunciation is, even to the present, kept on the last Sunday before Christmas. The Mozarabic Liturgy also celebrates a feast called the Expectation (or Advent) of St. John the Baptist on the Sunday preceding 24 June.
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Obstat, Nihil. Lafort, Remy, Censor. Entry for 'Feast of the Expectation of the Blessed Virgin Mary'. The Catholic Encyclopedia. https://www.studylight.org/encyclopedias/eng/tce/f/feast-of-the-expectation-of-the-blessed-virgin-mary.html. Robert Appleton Company. New York. 1914.
the Fifth Week after Easter