"Knyaz Igor" is an ancient East Slavic epic poem that tells the story of Igor Svyatoslavich, a prince of Kievan Rus. The poem recounts his military campaigns against the Polovtsians, a nomadic tribe, and highlights themes of bravery, loyalty, and the struggles of the Slavic people. The poem is notable for its rich imagery and emotional depth, reflecting the culture and values of the time. It is considered one of the earliest examples of East Slavic literature and provides insight into the historical context of the Kievan Rus during the 12th century.