In thanksgiving for the victory at Lepanto on the first Sunday of October 1571, Pope St. Pius V ordered that a commemoration of the Rosary should be made on that day.
At the request of the Dominican Order, in 1573 Pope Gregory XIII allowed the feast to be kept in all churches with an altar dedicated to the Holy Rosary.
In 1671, the observance of the feast was extended by Pope Clement X to the whole of Spain.
Pope Clement XI extended the feast to the universal Church after the important victory over the Turks gained by Prince Eugene on August 6, 1716, the feast of our Lady of the Snows, at Peterwardein in Hungary.