The legions of Rome were the nucleus of Rome’s military might for centuries. From campaigning in northern Scotland to the Persian Gulf, these devastating battalions extended and cemented Roman power. Yet of these legions there was one whose end is shrouded in mystery: the Ninth Legion. So what might have happened to this legion? Joining me to talk through the theories surrounding the Ninth's disappearance is Dr Simon Elliott. Simon has recently written a book all about the Ninth's disappearance, and in this podcast he takes us through the various theories and evidence surrounding this mystery.