Political map of Europe & the Mediterranean 14 January 69 AD (Year of the Four Emperors: Galba): Already 69 years old when he displaced the 30-year-old Nero, the weak and indecisive Galba proved to be unable to impose his authority in Rome. In January 69 AD the Rhine legions (Germania Inferior) mutinied against him, proclaiming their commander Vitellius—whom Galba had appointed to lead them just months earlier—as emperor. What would become known as the Year of Four Emperors had begun.