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The Indo-European (I.E.) languages are a family of kindred dialects spread over a large part of Europe, and of Asia as far as India.
The Slavonic languages proper themselves fall into two groups: (a) an Eastern and Southern group, including Old Bulgarian, the ecclesiastical language first known from the latter part of the 9th century A.D.; Russian in its varieties of Great Russian, White Russian and Little Russian or Ruthenian; and Servian and Slovene, which extend to the Adriatic.
Till the latter part of the 18th century it was the universal practice to refer all languages ultimately to a Hebrew origin, because Hebrew, being the language of the Bible, was assumed, with reference to the early chapters of Genesis, to be the original language.
That the (Old) Belarusian language was the direct evolvement from the Proto-Slavonic phase, with the earlier material evidences of this dated early 13th century.
The Belarusian, in its vernacular form, was the language of the smaller town dwellers and of the peasantry.
The reform was to simplify the grammar of the Belarusian language.