I want to know the answer to the following question:
Who was Duke of Normandy in 1066?
All the background I'm provided with is that "They faced a powerful rival in the Dukes of Normandy, who in 1066 under William the Conqueror (duke 1035–1087), conquered England (r. 1066–87) and created a cross-channel empire that lasted, in various forms, throughout the rest of the Middle Ages.". Is that enough to answer the question?
Answer: yes