Saint Pope Pius V, a Dominican, was a leader of the Catholic Reformation, especially by implementing the Council of Trent reforms. He established a Catechism, a missal, a seminary system, used a Tridentine approach to learning and preaching, had a residency requirement for Bishops and reformed women’s religious life. This formed the foundation of the Catholic Church for the next 500 years. In 1571, St. Pius V was instrumental in gathering a coalition of nations and petitioning prayers of Our Blessed Mother to save Europe from the Islamic Ottoman Turks at the Battle of Lepanto. He declared Mary as Our Lady of Victory because of this decisive battle. He died of natural causes.