In AD 408, the emperor Honorius made a startling declaration: Rome was old news, and the capital of the declining Roman Empire was now the northern city of Ravenna. The new capital was surrounded by marshland and easier to defend against barbarian tribes, but Honorius’s cunning plan to save the empire didn’t succeed, as Rome’s enemies simply bypassed Ravenna and took Rome anyway. As a result, the empire fell apart in less than 70 years, leaving Ravenna the capital of a new barbarian-controlled kingdom.