HELYOT, PIERRE (166o-1716), Franciscan friar and his torian, was born at Paris in Jan. 166o, and in 1683 entered the third order of St. Francis at Picpus, near Paris. During his travels to many parts of Europe on monastic business he collected materials for his great work, L'Histoire des ordres monastiques, religieux, et militaires, et des congregations seculieres (8 vols., 1714-21) . Helyot died on Jan. 5, 1716, before the fifth volume appeared, but his friend Maximilien Bullot completed the edi tion. The Histoire is a work of great historical importance, and is profusely illustrated by plates exhibiting the dress of the various orders. The material has been arranged in dictionary form in Migne's Encyclopedie theologique, under the title "Dictionnaire des ordres religieux" (4 vols., 1858). Helyot's only other note worthy work is Le Chretien mourant (1695).