Tsar and Kaiser were derivatives of what Roman title?
Kaiser Kaiser Kaiser is the German word for "emperor". Like the Bulgarian, Serbian and Russian Tsar it is directly derived from the Roman emperors' title of Caesar, which in turn is derived from the personal name of a branch of the "gens" (clan) Julia, to which Gaius Julius Caesar, the forebear of the first imperial family, belonged. Although the British monarchs styled "Emperor of India" were also called "Kaisar-i-Hind" in Hindi and Urdu, this word, although ultimately sharing the same Latin origin, is derived from the ("kaisar"), not the German "Kaiser". In English, the term 'the Kaiser' is usually reserved for
Tsar started to use the title of tsar regularly in diplomatic relations with the West. From about 1480, he is designated as "imperator" in his Latin correspondence, as "keyser" in his correspondence with the Swedish regent, as "kejser" in his correspondence with the Danish king, Teutonic Knights, and the Hanseatic League. Ivan's son Vasily III continued using these titles. Sigismund von Herberstein observed that the titles of "kaiser" and "imperator" were attempts to render the Russian term "tsar" into German and Latin, respectively. This was related to Russia's growing ambitions to become an Orthodox "Third Rome", after the Fall of Constantinople.