Prince Igor Svyatoslavich was a 12th-century ruler of the Kievan Rus', a federation of Slavic tribes in Eastern Europe. He is best known for his military campaigns against the Polovtsians, a nomadic group that threatened his territory. His reign is marked by efforts to consolidate power and expand his influence. Igor is also the central figure in the epic poem, the Song of Igor's Campaign, which recounts his unsuccessful expedition against the Polovtsians. This work is significant in Russian literature and provides insight into the culture and struggles of the time. Igor's legacy continues to be remembered in Russian history.