Jisho

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Wikipedia definition
1. Ruthenian languageRuthenian, or Old Ruthenian, is a term used for the varieties of Eastern Slavonic spoken in the Grand Duchy of Lithuania and later in the East Slavic territories of the Polish–Lithuanian Commonwealth. Scholars do not agree whether Ruthenian was a separate language or a Western dialect(s) of Old East Slavic, but it is agreed that Ruthenian has a close genetic relationship with it. Old East Slavic was the colloquial language used in Kievan Rus' (10th – 13th centuries).
Read “Ruthenian language” on English Wikipedia
Read “ルーシ語” on Japanese Wikipedia
Read “Ruthenian language” on DBpedia

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