Gallienus (218-268) is the Roman emperor who somehow mislaid nearly his entire inheritance without being particularly bothered. He started out co-ruler of an empire that stretched from Scotland to Iran but ended up with his authority limited to a tent, pitched up outside the walls of Milan. Gallienus is often called the 'Playboy Emperor' for his preference to enjoy the fun aspects of the job like celebrating his bedtime favourites with cheesecake mosiacs.