Peter Kanis was the son of a wealthy burgomaster of Nijmegen. He studied at Cologne, where he became the eighth member of the Society of Jesus in 1543 — only three years after the Society's foundation. He was the first Dutchman in the Jesuits and the first to be ordained.
His mission was the Catholic recovery of central Europe. Sent to Ingolstadt, Vienna, Prague, Augsburg, Innsbruck, and finally Fribourg, he taught theology, founded twenty Jesuit colleges, restored Catholic discipline to dozens of dioceses, attended the Council of Trent as a peritus, and served as Provincial of the new German province (1556–69). Through his preaching and patient catechesis the Catholic Counter-Reformation took root in southern Germany, Austria, Bohemia, and Switzerland.
His three catechisms — Summa Doctrinae Christianae (1555, for theologians), Catechismus Minor (1556, for young students), and Parvus Catechismus Catholicorum (1558, for children) — went through over 400 editions in his lifetime and became the standard catechetical instruments of Catholic Europe for two and a half centuries. He was canonised and made Doctor of the Church on the same day by Pius XI in 1925.

