In case you didn’t know, Bram Stoker didn’t invent vampires. No, neither did John Polidori, who wrote “The Vampyre,” the great-granddaddy of all vampire fiction. Vlad the Impaler certainly did exist, and by many accounts he was a monster. But he wasn’t a vampire. Nor was Countess Elizabeth Bathory, who bathed in the blood of virgins in an attempt to keep her youth. So who were the first vampires?