Grzegorz Knapski | |
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| Born | 1561  Gmina Grodzisk Mazowiecki, Polish–Lithuanian Commonwealth |
| Died | 10 November 1639 (aged 77–78) Kraków, Polish–Lithuanian Commonwealth |
| Occupation | Playwright, poet, Catholic priest, folklorist, scribe |
Grzegorz Knapski (Knapiusz, Cnapius; 1561–1639) was a Polish Jesuit, teacher, philologist, lexicographer and writer.
His most important work is the Thesaurus Polono-Latino-Graecus. First published in 1621 in Kraków, second edition in 1643 also in Kraków, it became a standard reference work in Polish schools and universities until the 18th century.