Alexander and Peter were two Russian Tsars who ruled in the late 17th and early 18th centuries. Alexander I was the Emperor of Russia from 1801 to 1825, while his brother Peter III was Tsar from 1762 to 1762. Both were members of the Romanov dynasty, which had been ruling Russia since 1613. Alexander I is remembered for his reforms and military successes, while Peter III is remembered for his short reign and his pro-Prussian policies.