Old Belarusian language

Old Belarusian was a historic East Slavic language, written and spoken at least in the 14th–17th century, and reported spoken as late as the very beginning of the 19th century,[2] in the Grand Duchy of Lithuania and later in the East Slavic territories of the Polish-Lithuanian Commonwealth, probably in the part of Grand Duchy of Moscow.[3]
The modern Belarusian

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