The major advocate for reform Reforming_a_system in Alexander 's regime was Count Mikhail Mikhailovich Speransky .

Returned Arriving from exile Removing in 1819 Count Mikhail Mikhailovich Speransky was appointed Change_of_leadership as the Governor of Siberia , with the task Confronting_problem of reforming Reforming_a_system local government .

Siege of Riga by the Russian Army under Tsar Alexei Mikhailovich was the main event Social_event of the Russo-Swedish War .

A few days later , the main army under Tsar Alexei Mikhailovich arrived Arriving on the ships on the Duna River , and laid siege Besieging to Riga .