Who was the first Russian King of Poland, whose Adjutant General was Pavel Alexandrovich Stroganov?
Alexander I of Russia Alexander I (Russian: Александр Павлович , Aleksandr Pavlovich; 23 December [O.S. 12 December] 1777 – 1 December [O.S. 19 November] 1825 ) reigned as Emperor of Russia from 23 March 1801 to 1 December 1825. He was the son of Paul I and Sophie Dorothea of Württemberg. Alexander was the first Russian King of Poland, reigning from 1815 to 1825, as well as the first Russian Grand Duke of Finland. He was sometimes called Alexander the Blessed.
Grand Duke Konstantin Pavlovich of Russia Konstantin Pavlovich (Russian: Константи́н Па́влович ; 27 April 177927 June 1831) was a grand duke of Russia and the second son of Emperor Paul I and Sophie Dorothea of Württemberg. He was the Tsesarevich of Russia throughout the reign of his elder brother Alexander I, but had secretly renounced his claim to the throne in 1823. For 25 days after the death of Alexander I, from 19 November (O.S.)/1 December 1825 to 14 December (O.S.)/26 December 1825 he was known as "His Imperial Majesty Konstantin I Emperor and Sovereign of Russia", although he never reigned and never acceded to the throne. His younger brother Nicholas became Tsar in 1825. The succession controversy became the pretext of the Decembrist revolt.