Luc COURTOIS. — The present contribution is devoted to the figure of Paulin Ladeuze (1870-1940), whose orientalist activity took place in three stages : the doctorate at the Catholic University of Leuven, with a thesis in the field of oriental cenobitism (1892-1898) ; the professorship, during which the young researcher devoted himself mainly to patrology and neo-testamentary exegesis (1898-1909); and finally the rectorate…