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The Normans were a minority ruling class in Sicily and, according to what some experts say, did not leave that much of a genetic imprint. I would be surprised if the 10% figure mentioned in the first post is confirmed as accurate. However, I'm certain there are some scattered Norman influences. Also, one must consider that throughout history many traders from Northern Europe as well as Northern Iberia travelled to Sicily and some may well have left their genetic mark (Celtic, Germanic, Nordic) on the island.