Avranches

Avranches was a key border stronghold controlling the frontier between Normandy and Brittany. Its episcopal see and castle made it important for both spiritual and military authority along the duchy's southwestern margin.

Why it mattered

• Border fortress with Brittany
• Episcopal see

Chronology (selected)

• 933: Cotentin and Avranchin annexed to Normandy
• 1172: Henry II performs penance here for Becket's murder

Hub essays

• Region context: normandy from grant to duchy and the shared bibliography.
• Castles and fortification: Norman castles — motte to stone.

On the map

Use Open on map to fly to this pin in the Norman expansion era. Layers are teaching overlays — pair them with charters, excavation reports, and the works above.