The word Tsar derives for which earlier famous leadership name and title?
Tsar Tsar Tsar ( or ; Old Church Slavonic: ц︢рь [usually written thus with a title] or цар, царь), also spelled csar, or czar, is a title used to designate East and South Slavic monarchs or supreme rulers of Eastern Europe, originally Bulgarian monarchs from 10th century onwards. As a system of government in the Tsardom of Russia and the Russian Empire, it is known as Tsarist autocracy, or Tsarism. The term is derived from the Latin word "Caesar", which was intended to mean "Emperor" in the European medieval sense of the term—a ruler with the same rank as a Roman
A Life for the Tsar gave his life in the expulsion of the invading Polish army for the newly elected Tsar Mikhail, the first of the Romanov dynasty, elected in 1613. The plot of "A Life for the Tsar" had been used earlier in 1815, when Catterino Cavos, an Italian-Russian composer, had written a two-act singspiel with the same subject and title. The original title of the opera was to be "Ivan Susanin", after the hero, but when Nicholas I attended a rehearsal, Glinka changed the title to "A Life for the Tsar" as an ingratiating gesture. This title was retained in the Russian Empire.