St. Pius V (original name Antonio Ghislieri) was the pope, the leader of the Roman Catholic Church, from 1566 to 1572. An ascetic, reformer, and relentless persecutor of heretics, he reigned during one of the most austere periods in the church’s history, including during the Inquisition to eliminate Protestantism in Italy and the period in which the decrees of the Council of Trent (1545–63) were put into effect.
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