 It is not quite clear whether this was put into execution; but it is certain that with the fall of Robespierre he regained his liberty and returned with shattered health to the convent in Heidelberg (1796).In 1799 he became professor of Oriental Languages, Exegesis and Pastoral Theology in Heidelberg.The Margrave of Baden withholding his consent to Dereser's acceptance of the office of coadjutor to the Bishop of Strasbourg, Dereser was transferred with the whole university to Freiburg (1807), but having given offence by a funeral sermon (1810) had to leave suddenly to Karlsruhe where he was a pastor, and then to Constance.