Title: Три ключа к "Слову о полку Игорове"
Subjects: Textual Criticism, Russian Folk drama, History and criticism, Romances, Slovo o polku Igoreve
People: Igorʹ Svi︠a︡toslavich novgorod-severskiĭ kni︠a︡zʹ (1151?-1202)