Annales School
Pirenne argued that profound social, economic, cultural, and religious movements in the long term resulted from equally profound underlying causes, and this attitude influenced Marc Bloch and the outlook of the French Annales School of social history. Though Pirenne had his opponents, notably Alfons Dopsch who disagreed on essential points, several recent historians of the Middle Ages have taken Pirenne's main theses, however much they are modified, as starting points.