  Du Bos’s final major work was the Histoire critique de l’établissement de la monarchie française dans les Gaules (Critical History of the Establishment of the French Monarchy in Gaul) (1734). The book’s thesis is that the Franks did not conquer Gaul. Rather, according to Du Bos, the Gauls invited them to become the rulers of what became France. The book won the praise of many, including Edward Gibbon, but it was effectively criticized by Montesquieu in The Spirit of the Laws.