#45: The Viking Rule in England
From 865, Vikings ruled parts of England, including major cities like London and York, for around 200 years, overriding Anglo-Saxon laws with their own in a region covering 15 shires.
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A treaty later demarcated Viking and Anglo-Saxon territories, allowing their cultures and laws to coexist peacefully on the British Isles. However, territorial ambitions eventually reignited tensions between the two groups.