Слово о полку Игореве
"The Tale of Igor's Campaign" ("Слово о пълкѹ Игоревѣ"), an epic poem in Old East Slavic, describes a failed raid made in the year 1185 by an army led by Prince Igor Svyatoslavich of Novgorod-Seversk (in the Chernigov principality of Kievan Rus' in modern Ukraine) against the Polovtsians (Cumans), Pagan Turkic nomads living along the southern banks of the Don River.