Riothamus and the British-Roman Resistance Against the Visigoths (c. 469 CE)

According to Jordanes, in The Origin and Deeds of the Goths, the British king Riothamus supports the Romans in their struggle against the Visigoths, who are expanding their power in Gaul under King Euric.

Riothamus and His British Army in Gaul

• Riothamus, sometimes considered a "King of the Britons", crosses into Gaul with a British army, likely a force of Brittonic warriors from Armorica (Brittany) or the British Isles.
• His troops are sent to reinforce the Roman war effort, possibly at the request of Syagrius, the ruler of the Domain of Soissons, who is desperately resisting Visigothic expansion.
• The British force is tasked with defending Roman territories in central Gaul, particularly in the district of Berry.

The Visigothic Ambush and Defeat of Riothamus

• As Riothamus and his forces advance, King Euric of the Visigoths intercepts them.
• Facing overwhelming odds, the British force is decisively defeated.
• This Visigothic victory cements their control over Berry, marking a major setback for the Romans and their allies.

The Aftermath and the Decline of Roman Influence in Gaul

The defeat of Riothamus’ forces further weakens Roman authority in Gaul and accelerates the Visigothic conquest of the region. With:

• Syagrius struggling to maintain control of northern Gaul,
• The Franks growing in power,
• And the Western Roman Empire in terminal decline,

the Visigoths emerge as the dominant force in southern and central Gaul, further consolidating their kingdom, which will later evolve into the Visigothic Kingdom of Toulouse.

Riothamus' campaign, though ultimately unsuccessful, reflects the wider struggle between the last remnants of Roman rule and the rising barbarian kingdoms, which will define the transition from Late Antiquity to the early medieval period.