A Roman Catholic order for men founded in 1540 by St. Ignatius of Loyola, a Spanish soldier who experienced a religious conversion while convalescing from a battle wound. It is a non-contemplative order requiring strict obedience, compliance with Ignatius' Spiritual Exercises, and special loyalty to the pope. The Jesuits abandoned many medieval practices including obligatory regular penances or fasts; a common dress; and the choral recitation of the liturgical office. Other innovations include their very centralized form of authority with life tenure for the head of the order; gradation of members; a probationary period of many years before final vows; and lack of a female branch. Jesuits carry out many kinds of missionary work with special emphasis on education; the order has founded many colleges and universities throughout the world. The Jesuits have been leading apologists for the Roman Catholic Church, particularly during the Counter-Reformation. In more recent times, the order has been highly influential in modernizing the Church.
Source: Art & Architecture Thesaurus
http://vocab.getty.edu/page/aat/300148103
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