Pope St. Pius V in 1572 ordered an annual commemoration of our Lady of Victory to be made to implore God's mercy on His Church and all the faithful, and to thank Him for His protection and numberless benefits, particularly for His having delivered Christendom from the arms of the infidel Turks by the sea victory at Lepanto in the previous year, a victory which seemed a direct answer to the prayers and processions of the rosary confraternities at Rome made while the battle was actually being fought. A year later Pope Gregory XIII changed the name of the observance to that of the Rosary, fixing it for the first Sunday in October (the day of Lepanto)... Pope Clement XI decreed that the feast of the Holy Rosary should be observed throughout the western Church. The feast is now kept on the date of the battle of Lepanto, October 7. [Butler's Lives of the Saints, October 7 (Our Lady of the Rosary) Vol IV 48]
Readings and Prayers (Latin and English): [Oct. 7 - The Most Holy Rosary of the Blessed Virgin Mary]
Gregorian Chant Antiphons (Proper of the Mass):
[Introit: Gaudeamus
omnes] [Alleluia]
[Offertory: In me gratia] [Communion: Florete
flores]
Ordinary of the Mass: Missa "Cum Iubilo" (Adoremus Hymnal #214-217): Mass IX [MP3] & Credo IV [MP3]
Marian Hymns: [Ave Maria (Adoremus #531)] [Salve Mater misericordiae (Adoremus #545)]
Read the poem by GKC in the ACS edition published by Ignatius Press.
Listen to an MP3 excerpt from GKC's poem "Lepanto".