Paul I of Russia
Paul remained overshadowed by his mother for most of his life. His reign lasted four years, ending with his assassination by conspirators. He adopted the laws of succession to the Russian throne—rules that lasted until the end of the Romanov dynasty and of the Russian Empire. He also intervened in the French Revolutionary Wars and, toward the end of his reign, added Kartli and Kakheti in Eastern Georgia into the empire which was confirmed by his son and successor Alexander I.
Battle of the Palaces
During the decade that separated Paul's death in 1801 and the French invasion of Russia in 1812, the Saint Petersburg court and its architects refined and modified Catherinian neoclassicism into the Russian version of Empire style. Alexander I has not actively engaged with architecture until post-war reconstruction, although he clearly preferred the art of Quarenghi, Thomas de Thomon and Andrey Voronikhin; construction of Voronikhin's Kazan Cathedral was launched just weeks after Paul's death. Outside Saint Petersburg, various Romantic styles based on Neo-Gothic architecture coexisted with prevailing official art. The aging architects involved in the "battle of the palaces" retired, making way to a new generation: