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Hippolyte Hélyot (born January 1660, Paris—died Jan. 5, 1716, Paris) was a French historian and Franciscan friar whose greatest work provides the definitive and most detailed source of information on Roman Catholic religious orders and lay congregations up to the end of the 17th century. After entering the Franciscan convent of Picpus in Paris in 1683, Hélyot was sent twice to Rome. Later, when he was appointed secretary of his order, his travels in France...