Grimoult du Plessis

The lands of Le Plessis comprised 10,600 hectares and extended across 12 parishes around the castle of Le Plessis-Grimoult.

[6] Grimoult was part of a conspiracy to assassinate William the Conqueror, who at that point was struggling to maintain control of the duchy of Normandy after the death of his father.

Grimoult and his co-conspirators raised an army of around 25,000 men and fought against William and his backer King Henry I of France at the Battle of Val-ès-Dunes.

Because Grimoult held less influence than the other conspirators he was the only one to be imprisoned in the tower of Rouen and then executed by the Duke.

Grimoult's lands were confiscated, his castle was destroyed and his barony was given to the Duke's half brother Odo, the Bishop of Bayeux, for the use of the church.