The Kingdom of Brittany (Breton: Rouantelezh Breizh) was a short-lived vassal-state of the Frankish Empire that emerged during the Norse invasions.

The kingdom fell into a period of turmoil caused by Norse invasions and a succession dispute between Salomon's murderers: Gurvand and Pascweten.

At the end of the Antiquity period, additional Celtic Britons, fleeing the Anglo-Saxon settlement of Britain (5th-7th centuries), settled in the same region.

As a result of these settlements, Celtic culture was revived in Gallo-Roman Armorica and independent petty kingdoms arose in this region, namely Cornouaille, Domnonée and Broërec.

In order to bring Brittany into the Empire's sphere of influence, Louis the Pious appointed Nominoe, a noble Briton, head of the region.

Seeking revenge, Charles the Bald invaded Brittany with an army drawn from both the western and eastern parts of the Frankish empire.

But Erispoe was murdered the same year by his cousin Salomon who took the throne of Brittany and allied himself with the Normans to capture the Frankish city of Le Mans.