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Wrong, Russians spoke the Old Russian language. Слово о плъкоу Игоревѣ was written in Old Russian. Old Church Slavonic is a different thing.

• lisivka 10y ago
  There is no such thing as "Old Russian". "Слово о плъкоу Игоревѣ" is written in "folk language", which then evolved to Ukrainian language.
  • iopq 10y ago
    That's what Old Russian is - the language of Kievan Rus and related dialects.