where was the duke from?
Duchy of Normandy in north-western France.
Duke of Normandy
n the Middle Ages, the Duke of Normandy was the ruler of the Duchy of Normandy in north-western France. The duchy arose out of a grant of land to the Viking leader Rollo 
what were the results of the norman conquest William's force defeated Harold, who was killed in the engagement who led the conquest? Duke of Normandy later styled William the Conqueror.
wiki:1849340
Duke of Normandy [SEP] Introduction
In the Middle Ages, the Duke of Normandy was the ruler of the Duchy of Normandy in north-western France. The duchy arose out of a grant of land to the Viking leader Rollo by the French king Charles III in 911. In 924 and again in 933, Normandy was expanded by royal grant. Rollo's male-line descendants continued to rule it down to 1135. In 1202 the French king Philip II declared Normandy a forfeited fief and by 1204 his army had conquered it. It remained a French royal province thereafter, still called the Duchy of Normandy, but only occasionally granted to a duke of the royal house as an apanage.