Final answer:
Ivan Susanin is the peasant hero during the Time of Troubles who led the Poles into a swamp and was immortalized by Mikhail Glinka. He sacrificed his life to save the Russian Tsar.
Step-by-step explanation:
The peasant hero during the Time of Troubles who led the Poles into a swamp and was later immortalized by the Russian opera writer Mikhail Glinka was Ivan Susanin. Ivan Susanin is known for his heroic action of misleading the invading Polish army into a swamp and sacrificing his life to save the Russian Tsar, Mikhail Romanov. This story of heroism was the inspiration for Mikhail Glinka's opera 'A Life for the Tsar' (also known as 'Ivan Susanin').