The term 'Bygone Emperor' refers to TSAR, a title used by the emperors of Russia from 1547 to 1917. TSAR is a Russian word derived from the Latin word Caesar, which was used to refer to Roman emperors. The Tsars were absolute rulers of Russia and held immense power over their subjects. They were also responsible for the expansion of the Russian Empire and its modernization. The last TSAR of Russia was Nicholas II, who was overthrown in the Russian Revolution of 1917.