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.
Second League of Armed Neutrality
In addition to this, Prussia invaded Hanover in April 1801 as a way to attack the British. Paul's death in March 1801 and the accession of Alexander I led to a change of policy in Russia, and the alliance collapsed. Russia later joined the British in a coalition against Napoleonic France.