Which Russian emperor is famous for modernizing Russia and for changing the official title of “tsar” to “emperor”?

Which Russian emperor is famous for modernizing Russia and for changing the official title of “tsar” to “emperor”? Correct Answer Peter I

Peter I modernized Russia and changed his official title from “tsar” to “emperor” after the Second Northern War (1700–21). His reforms led to development of Russia’s economy and trade, education, science and culture, and foreign policy.
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