St. Peter Canisius was a 16th-century Jesuit scholar and a strong opponent of Protestantism. He is known as the second apostle of Germany (St. Boniface being the first) for his defense of Roman Catholicism there during the Counter-Reformation. He was canonized in 1925 by Pope Pius XI, who also declared him a doctor of the church, a title granted to saints whose writings and teachings are of particular importance.
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