North Sea Empire: Map & History
The North Sea Empire, also known as the Anglo-Scandinavian Empire, was the personal union of the kingdoms of England, Denmark and Norway for most of the period between 1013 and 1042 towards the end of the Viking Age.
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Historiographical synthesis & structured realm registry
The North Sea Empire, also known as the Anglo-Scandinavian Empire, was the personal union of the kingdoms of England, Denmark and Norway for most of the period between 1013 and 1042 towards the end of the Viking Age. This ephemeral Norse-ruled empire was a thalassocracy, its components only connected by and dependent upon the sea.
Modern Countries Once Part of North Sea Empire
At its mapped extent, North Sea Empire covered territory in 4 present-day countries. The period shown is when the mapped borders include that country, and the note says how much of it.
- Denmark1018–1039 CE · most
- Norway1028–1039 CE · most
- United Kingdom1018–1039 CE · most
- Sweden1018–1039 CE · a small part
States and Provinces
Largest Present-Day Cities in Its Territory
Each opens on the live map inside North Sea Empire's borders of that time.
Derived by testing mapped cities against this polity's dated territorial polygons, so the list is indicative and follows the borders in the source dataset.
North Sea Empire Timeline
Key historical inflections from foundation to peak territorial expansion
Expansion to peak recorded area of 484,573 km² in 1036 CE.
North Sea Empire: Frequently Asked Questions
When did the North Sea Empire exist?
The North Sea Empire is dated to 1018 CE – 1039 CE, in the High & Late Middle Ages era.
What was the capital of the North Sea Empire?
The capital of the North Sea Empire was Winchester, England.
How large was the North Sea Empire at its peak?
At its peak in 1036 AD the North Sea Empire covered about 484,573 km².
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