some historian have argued that vlad also learned the art of impalement during his time as a hostage,but that can't be proven,according to florin curta,a professor of medieval history and aschaeology at the university of florida.the ottomans didn't invent impalement,and there's no way of knowing whether vlad saw them deploy this gruesome punisment on their prisoners,curta told live science.busted:medieval torture's 10 biggest myths