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As far as I know, the American comic book authors made Dracula a vampire. Maybe I'm wrong.
And the historical prototype of Dracula, Vlad the Impaler, didn't drink blood. He had a different pastime – impaling people. Mostly Turkish and other Muslim prisoners. And he got his nickname ("Dracula") because he was a member of the "Order of the Dragon" (the only Orthodox equivalent of Western European knightly orders) and constantly wore some kind of attribute of this order.
But I don't understand why they later turned him into a vampire.

