Paul I of Russia
Paul I (; "Pavel Petrovich") ( – ) reigned as Emperor of Russia between 1796 and 1801. Officially, he was the only son of Peter III and Catherine the Great, though Catherine hinted that he was fathered by her lover Sergei Saltykov, who also had Romanov blood, being a descendant of the first Romanov tsar's sister, Tatiana Feodorovna Romanova.
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.