Jansen, Cornelis kôrnā´lĭs yän´sən [key], 1585–1638, Dutch Roman Catholic theologian. He studied at the Univ. of Louvain and became imbued with the idea of reforming Christian life along the lines of a return to St. Augustine. He established a close friendship with Duvergier de Hauranne, a fellow student, with whom he shared and developed many of his theological ideas. In 1630, Jansen became professor at Louvain, and in 1636 bishop of Ypres. Out of his lifework, the posthumous Augustinus (1642, in Latin), arose the great movement called Jansenism.
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