Meletius Smotrytsky

Meletius Smotrytsky, Archbishop of Polotsk, was a writer, a religious and pedagogical activist of the Polish–Lithuanian Commonwealth, and a Ruthenian linguist whose works influenced the development of the Eastern Slavic languages. His book Slavonic Grammar with Correct Syntax (1619) systematized the study of Church Slavonic. It became the standard grammar book in Russia until the end of the 18th century.