The schism between mother and son [Catherine the Great and her son Paul I of Russia] stretched beyond the grave. When finally, in 1796, he reached the throne, Paul immediately restored primogeniture as the basis of succession to the crown. Thereafter, until the fall of the monarchy and the Romanov dynasty in 1917, the eldest son of the deceased sovereign - or, lacking a son, the eldest male closest in the direct family line - would succeed. Never again would an heir have to go through what Paul had been through.
And never again would Russia be ruled by a woman.
— Catherine the Great: Portrait of a Woman by Robert K. Massie (via myhistoryobsession)