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.
Assassination
In the modern world, the killing of important people began to become more than a tool in power struggles between rulers themselves and was also used for political symbolism, such as in the propaganda of the deed. In Russia alone, two emperors, Paul I and his grandson Alexander II, were assassinated within 80 years. In the United Kingdom, only one Prime Minister has ever been assassinated—Spencer Perceval on May 11, 1812.