+The **Duke of Normandy** was the traditional ruler of the [Duchy of Normandy](/wiki/duchy_of_normandy) in northwestern France. This powerful title became historically pivotal when [William I](/wiki/william_i), Duke of Normandy, conquered England in 1066, profoundly shaping both nations.
+## See also
+- [Duchy](/wiki/duchy)
+- [Normandy](/wiki/normandy)
+- [Monarchy](/wiki/monarchy)
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