Gilbert, Count of Brionne

Gilbert de Brionne was son of Geoffrey, Count of Eu (otherwise cited as 'Godfrey'), who was an illegitimate child of Richard I of Normandy.

A number of Norman barons, including Ralph de Gacé, refused to accept William as their leader.

This appears to have been an act of vengeance for the wrongs inflicted upon the orphan children of Giroie by Gilbert,[5] and it is not clear what Ralph de Gacé had to do in the business.

Gilbert's children would accompany Duke William on his conquest of England and his descendants would become one of the most powerful noble families in the British isles.

They would rule over vast lands in modern-day Ireland, Scotland, and England and become powerful Marcher Lords.