Jablonskis (December 30, 1860, Kubilenai - February 23, 1930, Kaunas).
He developed the standard Lithuanian language. He prepared Lietuviskos
kalbos gramatika (The Grammar of the Lithuanian Language) and published
it under the pen-name of Petras Kriausaitis in Tilze in 1901. The book
included the programme of the standardization of the Lithuanian language which
was based on the dialect of Upland Lithuanians of Kaunas area. His Lietuviu kalbos gramatika, first published in Vilnius
in 1919, remains one of the best and most complete textbooks of the
Lithuanian language for the college students and secondary school teachers.
Jonas Jablonskis' works on syntax, including Lietuviu kalbos sintakse (The
Syntax of the Lithuanian Language.) and Linksniai ir prielinksniai
(Cases and Prepositions), have been of great significance to the Lithuanian
linguistics. He published over 150 articles on the issue of language in Varpas
and other periodicals. Jablonskis edited the literary works by Zemaite,
Gabriele Petkevicaite-Bite, Jonas Biliunas and other Lithuanian writers.