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.
Peter III of Russia
In December 1796, after succeeding Catherine, Peter's son, Emperor Paul I of Russia, who disliked his mother's behaviour, arranged for Peter's remains to be exhumed and reburied with full honors in the Peter and Paul Cathedral, where other tsars were buried.