Pope Pius V (d. 1572) was born on January 17, 1504.

Pope Pius V, born Antonio Ghislieri, was head of the Catholic Church and ruler of the Papal States from 8 January 1566 to his death in 1572. He is venerated as a saint of the Catholic Church. He is chiefly notable for his role in the Council of Trent, the Counter-Reformation, and the standardization of the Roman Rite within the Latin Church. Pius V declared Thomas Aquinas a Doctor of the Church.