Russian tsar (1682-1725) who Westernized Russia, founded St. Petersburg, and built Russia into a European great power.
Closely associated with
Catherine the Great (later Westernizing Russian empress).
For an intellectual contrast, see
Old Believers, Russian Orthodox traditionalist movement that rejected Patriarch Nikon's reforms and Peter's modernization — Peter's beard-shaving decrees, Western dress laws, and calendar changes triggered a religious-cultural schism — the founding poles of Russia's eternal 'European modernity vs Slavic tradition' debate that runs through Slavophiles, Solzhenitsyn, and contemporary Putin-era ideology.