Revolt of the Bretons against West Francia

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Was a war between the Bretons and the Frankish Empire where Brittany became effectively independent of the Frankish Empire.

Chronology

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August 851: As the Bretons decisively defeated the Franks in the Battle of Jengland (851), Brittany became effectively independent of the Frankish Empire.

January 852: By this agreement of Angers, Charles the Bald recognized Erispoë as king of Brittany and undertook never again to dispute that the countries of Rennes, Nantes and Retz are Breton land.