St. Pius V
The last great naval battle against the Turks was the Battle of Lepanto in 1571. If the Christians lost, the Muslims would begin their conquest of Europe
Pope Pius V called all Christians in Rome to pray the Rosary, asking Our Lady to grant the Christians victory. Catholics already loved and trusted Pius V because he had made sweeping reforms in the Vatican, simplifying and reorganizing the life of the Church. They prayed the Rosary as he asked, and their prayers to the Mother of God brought victory to the Christian military and saved Europe.