Catherine II, most commonly known as Catherine the Great, was the reigning empress of Russia from 1762 to 1796. She came to power after overthrowing her husband, Peter III. Under her long reign, inspired by the ideas of the Enlightenment, Russia experienced a renaissance of culture and sciences, which led to the founding of many new cities, universities, and theatres, along with a large-scale immigration from the rest of Europe and with the recognition of Russia as one of the great powers of Europe.

The emperor and autocrat of all Russia, also translated as emperor and autocrat of all the Russias, was the official title of the Russian monarch from 1721 to 1917.