Attila The Hun’s Shocking Vision. Unbelievable things do happen. Attila The Hun was a savage and merciless marauder, a tyrant that ruled a tribal empire. During his reign, he was one of the most feared enemies of the Roman Empire, What do you think would probably happen when Attila invaded Rome and faced off against Saint Pope Leo I? You might be surprised. Listen to an astounding eyewitness account of a face to face confrontation that changed the course of history.