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Explanation

A heptarchy is a form of government where a country is divided into seven separate kingdoms, each ruled by its own king.

The word itself comes from the Greek words "hepta" (seven) and "archē" (rule). 

The seven kingdoms of:

1. East Anglia
2. Essex
3. Kent
4. Mercia,
5. Northumbria
6. Sussex
7. Wessex