Explanation: The tyrannical Roman Emperor Caligula was not known as Caligula during his reign. 'Caligula' means 'Little boots' or 'Little sandals', from the military footwear of Roman legionaries - when Caligula was a young boy, his father, Germanicus, took him with him on campaigns, dressed up in a miniature soldier's outfit. The troops loved him, and took to calling him Caligula - a nickname which he did not appreciate when he was older!