DUCHESNE, dü"shên', LOUIS MARIE OLIVIER: French Roman Catholic; b. at St. Servan (100 m. n. of Nantes) Sept. 13, 1843. He studied in Paris and at Rome from 1873 to 1876, visiting Epirus, Thessaly, Macedonia, and Mt. Athos in 1874, and making a tour of Asia Minor in 1876. From 1877 to 1895 he was professor of church history in the Institut Catholique de Paris, and since the latter year has been director of the French school at Rome. He was also maitre de conférences and later directeur d'études at the École des Hautes Études, Paris, 1885-95, and in 1888 was elected a member of the Académie des Inscriptions et Belles-Lettres. He has written De Macario Magnete et scriptis ejus (Paris, 1877); Étude sur le Liber Pontificalis (1877); Mémoire sur une mission au Mont Athos (1877; in collaboration with C. Bayet); Vita Sancti Polycarpi auctore Pionio (1881); Le Liber Pontificalis: Texte, introduction et commentaire (2 vols., 1886-92); Origines du culte chrétien (18891 Eng. transl. by M. L. McClure under the title Christian Worship: Its Origin and Evolution, London, 1902); Les Anciens Catalogues épiscopaux de la province de Tours (1890); Pastes épiscopaux de I'ancienne Gaule (2 vols., 1894-99); Autonomies ecclésiastiques (1896); Les Premiers Temps de 1'etat pontifical (1898); Le Forum chrétien (Rome, 1899); Autonomies ecclésiastiques, églises séparées (1904; Eng. transl., Churches Separated from Rome, New York, 1908).