The Tale of Bygone Years (Old Church Slavonic: Повѣсть времѧньныхъ лѣтъ, Pověstĭ Vremęnĭnyhŭ Lětŭ) or Primary Chronicle is a history of Kievan Rus' from about 850 to 1110, originally compiled in Kiev about 1113. The work is considered to be a fundamental source in the interpretation of the history of the Eastern Slavs.