According to Wikipedia,
Henri Pirenne was a Belgian historian. A medievalist of Walloon descent, he wrote a multivolume history of Belgium in French and became a prominent public intellectual. Pirenne made a lasting contribution to the study of cities that was a controversial interpretation of the end of Roman civilization and the rebirth of medieval urban culture. He also became prominent in the nonviolent resistance to the Germans who occupied Belgium in World War I.
Henri Pirenne is affiliated with the following schools: