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In page History of Belarus:

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Despite these conflicts, the literary tradition of Belarus evolved. Until the 17th century, the Ruthenian language, the predecessor of modern Belarusian, was used in the Grand Duchy as a chancery language, that is, the language used for official documents. Afterwards, it was replaced with the Polish language, commonly spoken by the upper classes. Both Polish and Ruthenian cultures gained a major cultural centre with the foundation of the Academy of Vilna. At the same time, the Belarusian lands entered a path of economic growth, with the formation of numerous towns that served as centres of trade on the east–west routes.[citation needed]