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After reading the amazing Conquest trilogy, by Jack Ludlow, I got this idea for a AHC.
The first sons of Tancred, Serlo, William Iron Arm, Drogo and Humphrey, were, by their mother, nephew's of Robert the Magnificent, Duke of Normandy and the father of William the Conqueror.
Your challenge is putting one of the brothers as Duke of Normandy.
Extra points for:
your POD not being William dying as a child;
having the de Hauteville leading a Normand conquest of England;