The barony on the Anjou march north of Nantes, between Pouancé and the Vilaine; an Arthur partisan.
Who he is
- Name
- Geoffrey of Châteaubriant (numbered Geoffrey III)
- Title
- Lord of Châteaubriant
- Since
- Not pinned
- Born
- Not pinned
- Confidence
- medium
Named among Arthur's backers in the French Wikipedia life of Arthur.
Overlord
The duke of Brittany
What it holds
- Castle and town of Châteaubriant
- Rougé and the march parishes
How it was acquired
Hereditary.
Allies and rivals
Arthur's party; neighbours La Guerche and the Angevin Craonnais.
How things stand that morning
Holds for Arthur's government; quiet.
Wealth
Iron and forest of the march, market.
Military
Castle of Châteaubriant.
Threats
- The Anjou march
Places of note
- Castle of Châteaubriant: Seat
Where the sources disagree
Evidence: Name from a secondary list.
On the map: Approximate.
Primary sources for Brittany
Chronicles, registers, sagas and inscriptions written in or near 1200 that cover this entry. Each has its own page with editions, translations and where to read it.
- Chronicles of the Churches of Anjou (Saint-Aubin, Saint-Serge, Saint-Florent and others), Various (monks of Angers and the Loire) (11th to 13th centuries; the Saint-Aubin annals run to the 1220s). The Angevin houses' own annals of the succession crisis in their city: Arthur received at Angers in 1199 with Constance and the Breton and Angevin barons, John's counter-moves, the defection of William des Roches and the Angevin lords to John, and the peace of 1200 that left Arthur John's vassal. Read online
- The Great Chronicle of Tours, Anonymous (a canon of Saint-Martin of Tours) (about 1227). The Loire valley's view of the Angevin succession. Read online
- History of the Dukes of Normandy and the Kings of England, Anonymous of Bethune (a clerk in the household of Robert VII of Bethune) (about 1220). A Flemish lord's clerk writing twenty years on, with a soldier's interest in who fought whom. Read online
- The Acts of Philip Augustus, with Delisle's Calendar, Various (the French royal chancery) (1179 to 1223). The king's own charters and treaties for the year: the peace of Peronne with Baldwin IX in January 1200, the treaty of Le Goulet with John on 22 May 1200, the marriage settlement for Louis and Blanche, the privilege for the scholars of Paris, grants to towns, abbeys and Norman lords, and the first acts of the king's new acquisitions in the Vexin, Evreux and Berry. Read online
Sources and studies
Last revised 4 November 2026. Published 4 November 2026. Suggest a correction on the OMNIA Discord.