Arguing that the break with antiquity and the decline of Western civilization was due not to Germanic invasions but the advance of Islam, for 10 points, identify this theory of European development named for the Belgian historian who proposed it.
Among the nine main reasons its formulator laid supporting it were the observations that tax collection was disorganized and lending money at interest was prohibited. Its formulator also argued on behalf of the significant achievements of Cassiodorus and particularly Boethius. Britain was exempted from it as was Venice due to their isolation and multiple trade routes respectively. It was introduced in the book Medieval Cities and became crystallized in its formulator's follow-up Mohammed and Charlemagne. Arguing that the break with antiquity and the decline of Western civilization was due not to Germanic invasions but the advance of Islam, for 10 points, identify this theory of European development named for the Belgian historian who proposed it.
Among the nine main reasons its formulator laid supporting it were the observations that tax collection was disorganized and lending money at interest was prohibited.
Pirenne thesis