St. Pius V
Born Antonio Ghislieri, Pius V was Pope from 1566 to 1572. Throughout his papacy, one of his main goals was to implement the reforms laid out by the Council of Trent. Though his papacy lasted only six years, Pius V saw the founding of new seminaries, fought against corruption and nepotism, served the poor and sick of Rome, and published the 1570 Roman Missal, which remained mostly unchanged for 400 years. After a miraculous victory against the Ottoman Empire at the Battle of Lepanto in 1571, Pius V instituted the Feast of Our Lady of Victory in thanksgiving for the intercession of our Blessed Mother.