Treaty of Saint-Clair-sur-Epte
Charles III's land settlement with Rollo and the Seine Vikings
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Original prompt & settings (JSON) ↗The best near-contemporary proof is half a sentence buried in a royal charter issued about seven years later.
What can be recovered
Around 911, Charles III granted Rollo and his followers Frankish territory centred on Rouen. That is the recoverable core of the event traditionally called the Treaty of Saint-Clair-sur-Epte.
No treaty text or contemporary narrative of the negotiation survives, so the familiar label can wrongly suggest historians possess one.
The earliest surviving documentary confirmation is Charles's charter of 14 March 918, which excepted land granted to the Seine Normans — specifically Rollo and his companions — for the protection of the kingdom.
What the charter does not say
It confirms an earlier grant but states no date, no boundaries, no baptismal conditions, no homage ritual, and no title for Rollo.
Homage, baptism, the meeting at Saint-Clair-sur-Epte and the detailed territorial terms come principally from Dudo of Saint-Quentin, writing roughly a century later for the Norman ruling house.
The year, the place and even the season rest chiefly on that later account.
Not a duchy yet
Rollo was not demonstrably made first Duke of Normandy. His contemporary title is unknown, and Count of Rouen is undocumented for him.
The Epte-to-Risle boundary, the division among chieftains, the rejected grant of Flanders and the personal homage ceremony all depend on later narrative tradition.
Conversion was uneven as well: a papal response from the 910s discusses baptized Northmen who continued pagan practices.
Sources
Researched 23 Aug 2026 5 sources not yet audited Traditional date
How this was checked
Researched from the web into a fact sheet and rewritten from that sheet. This article has not yet had an independent model audit. How the pipeline works →
Traditional date. Conventionally dated here; the research places it at ~0911.
What the sources leave uncertain
- No treaty text or contemporary narrative of the negotiation survives.
- The year 911 and location Saint-Clair-sur-Epte depend chiefly on Dudo's later account. Even 'autumn' is a reconstruction, not a documented date.
- The 918 charter confirms an earlier grant to Rollo and his companions but does not state its date, boundaries, baptismal conditions, homage ritual, or Rollo's title.