The legendary hero of Sherwood Forest, Robin Hood, is a figure who has in equal measure attracted and baffled historians for decades. With the first mention of him coming in Old English ballads, it was long assumed that it was almost impossible that he ever existed at all, and that he firmly belonged in the realm of Errol Flynn, Kevin Costner, and even Mel Brooks movies. Only a few historians have dared to venture that Robin of Sherwood was, in...