Final answer:
The first Romanov tsar was Mikhail, who was elected to the throne in 1613, initiating the Romanov dynasty that ruled Russia until the Russian Revolution in 1917.
Step-by-step explanation:
The first Romanov tsar was Mikhail. The Romanov dynasty began after the Time of Troubles, a period of political crisis in Russia that followed the end of the Rurik Dynasty. Mikhail Romanov was elected to the throne by the Zemsky Sobor (the Russian national assembly) in 1613, marking the start of the Romanov dynasty that would rule Russia until the abdication of Tsar Nicholas II in 1917 during the Russian Revolution.
He declared himself Tsar of all the Russias in 1547. Ivan IV annexed several khanates and expanded the Russian Empire during his reign.