I've come to be quite impressed with this little known emperor and I don't think he gets enough credit. I am particularly interested in his wars against the Lombards (being the last Roman emperor to step foot in Rome itself). How successful was he? Is there any evidence that he was hoping to use Italy and Sicily as a base from which to fight the Muslims in North Africa? I know Medieval History (the magazine) did a story on it, but is there anything more in-depth? What about primary sources?