answers: Tsar
context: the usage of the titles Tsar and Autocrat ("samoderzhets"). His insistence on recognition as such by the emperor of the Holy Roman Empire since 1489 resulted in the granting of this recognition in 1514 by Emperor Maximilian I to Vasili III. His son Ivan IV emphatically crowned himself Tsar of Russia on 16 January 1547. The word "Tsar" derives from Latin Caesar, but this title was used in Russia as equivalent to "King"; the error occurred when medieval Russian clerics referred to the biblical Jewish kings with the same title that was used to designate Roman and Byzantine rulers — </s> large numbers of Christians from an ethnically diverse range of communities in Kars Oblast, particularly the Georgians, Caucasus Greeks and Armenians, each of whom hoped to achieve protection and advance their own regional ambitions on the back of the Russian Empire. In 1881 Alexander II was assassinated by the Narodnaya Volya, a Nihilist terrorist organization. The throne passed to Alexander III (1881–1894), a reactionary who revived the maxim of "Orthodoxy, Autocracy, and Nationality" of Nicholas I. A committed Slavophile, Alexander III believed that Russia could be saved from turmoil only by shutting itself off from the subversive influences of Western </s> ceremony in which the Emperor was crowned and invested with regalia, then anointed with chrism and formally blessed by the church to commence his reign. Although rulers of Muscovy had been crowned prior to the reign of Ivan III, their coronation rituals assumed overt Byzantine overtones as the result of the influence of Ivan's wife Sophia Paleologue, and the imperial ambitions of his grandson, Ivan IV. The modern coronation, introducing "European-style" elements, replaced the previous "crowning" ceremony and was first used for Catherine I in 1724. Since czarist Russia claimed to be the "Third Rome" and the replacement of Byzantium
question: what were the emperors of the russian empire called