In 1920 Chenu was appointed Professor of the History of Dogma at Le Saulchoir (and in late 1921 turned down a request from his doctoral supervisor Garrigou-Lagrange's to return to the Angelicum as a lecturer).[5] He began to develop his theological perspective replacing the non-historical approach to Thomism that he had learned from Garrigou-Lagrange at the Angelicum with an historicist reading of Aquinas. At Le Saulchoir he was the teacher of Dominicans Yves Congar and Edward Schillebeeckx.In 1930 Chenu founded the Institut d'Etudes M�di�vales de Montr�al.[1]Chenu served as rector of Le Saulchoir from 1932 to 1942, [6] and was therefore very involved in the move of Le Saulchoir from Belgium to �toilles, near Paris, in 1937.In 1937 Chenu privately issued a book entitled Une �cole de th�ologie: Le Saulchoir.[7] In February 1938 he was called to Rome and reprimanded for this work.[citation needed] Then, in February[citation needed] 1942, Une �cole de th�ologie was placed on the Vatican's Index of Forbidden Books because of its ideas about the role of historical studies in theology.[7] He was removed as rector of Le Saulchoir.[7] He would never again teach there. Friends got him a post at the �cole des Hautes �tudes in Paris, and he subsequently taught at the Sorbonne and the Institut catholique de Paris.