On October 7, Catholics remember Our Lady of the Rosary.
The feast was actually instituted under another name: In 1571 Pope Pius V instituted “Our Lady of Victory” as an annual feast in thanksgiving for Mary’s patronage in the victory of the Holy League over the Muslim Turks in the Battle of Lepanto. Two years later, in 1573, Pope Gregory XIII changed the title of this feastday to “Feast of the Holy Rosary.” And in 1716, Pope Clement XI extended the feast to the whole of the Latin Rite, inserting it into the Roman Catholic calendar of saints, and assigning it to the first Sunday in October. In 1913, Pope Pius X changed the date to October 7, as part of his effort to restore celebration of the liturgy of the Sundays.
The Battle of Lepanto
On October 7, 1571, a patchwork fleet of Catholic ships primarily from Spain, Venice and Genoa, under the command of Don Juan of Austria, was at a distinct disadvantage. The much larger fleet of the Ottoman Empire—a force with 12,000 to 15,000 Christian slaves as rowers—was extending toward Europe.
The toll of the sea battle was great: The Holy League lost 50 of its galleys and suffered some 13,000 casualties. The Turks, however, lost much more: Their leader Ali Pasha was killed, along with 25,000 of his sailors. The Ottoman fleet lost 210 of its 250 ships, of which 130 were captured by the Holy League. Coming at what was seen as a crisis point for Christianity, the victory at Lepanto stemmed Ottoman incursion into the Mediterranean and prevented their influence from spreading through Europe. Through the intervention of Our Lady, the Hand of God prevented the Muslims of the East from overcoming the Christian West.
The epic victory has been commemorated in literature: Miguel de Cervantes, a Spanish soldier wounded in the battle, recovered to become a novelist, poet and playwright; and he was so inspired by this battle that he incorporated elements of it in his own acclaimed novel, Don Quixote. And philosopher/writer and Christian apologist G.K. Chesterton retold the story in his 1915 ballad, Lepanto.