Post-Roman Britain

The Rise and Fall and Rise and Fall of Cities

My visits to Heuneburg and Haithabu/Hedeby reminded me that I don’t know enough about one of the great puzzles in world history: why cities spread so slowly, with frequent retreats and abandonments. There were towns in the Balkans before the Indo-Europeans came, but it was almost the year 1,000 before there was a single town on the Baltic, and that was burned and abandoned. Why did it take 5,000 years for cities to spread from Mesopotamia to Denmark, when other innovations spread in a few centuries? And why did many societies which once had prosperous cities give them up?
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