 Konstantinas Sirvydas

Konstantinas Sirvydas (rarely referred as "Konstantinas Širvydas"; ; ; – 8 August 1631) was a Lithuanian religious preacher, lexicographer and one of the pioneers of Lithuanian literature from the Grand Duchy of Lithuania, at the time a confederal part of the Polish–Lithuanian Commonwealth.He was a Jesuit priest, a professor at the Academia Vilnensis and the author of, among other works, the first grammar of the Lithuanian language and the first tri-lingual dictionary in Lithuanian, Latin and Polish (1619).