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.
Alexander I of Russia
Alexander became tsar of Russia when his father was assassinated 23 March 1801. Alexander, then 23-year-old, was actually in the palace at the moment of the assassination, to whom General Nicholas Zubov, one of the assassins, announced his accession. Historians still debate Alexander's role in his father's murder. The most common opinion is that he was let into the conspirators' secret and was willing to take the throne but insisted that his father should not be killed. Becoming Tsar through a crime that cost his father's life would give Alexander a strong sense of remorse and shame.