Rollo's defeat at Chartres led directly to the founding of the County of Rouen, the precursor to the Duchy of Normandy.
Key Facts
- Date of relief army arrival
- July 911
- Viking leader
- Rollo
- Frankish king
- Charles the Simple
- Territory granted after defeat
- County of Rouen (mouth of Seine to Rouen)
- Rollo's prior raid on Rouen
- 876
Location
Cause → Event → Consequence
During a period of repeated Viking incursions into the Frankish realms, Rollo led a Norse force to besiege the city of Chartres in West Francia in spring 911. The Vikings had previously raided and seized Rouen in 876, and continued to press into Frankish territory, prompting a military response from the Frankish kingdom.
Rollo and his Viking forces besieged Chartres but failed to take the city. A Frankish relief army arrived in July 911 and engaged the Norse forces, defeating them and lifting the siege. The battle ended Norse ambitions at Chartres and forced Rollo to negotiate rather than continue military conquest.
Following his defeat, Rollo accepted terms from Charles the Simple: in exchange for an oath of fealty and conversion to Christianity, he received a territory between the mouth of the Seine and Rouen. This grant, formally established as the County of Rouen, expanded over subsequent decades into the Duchy of Normandy, reshaping the political map of medieval Europe.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Rollo.
Side B
1 belligerent
Charles the Simple.