Ivan Petrovych Uzhevych (born 1610s, perhaps North Volhynia after 1645) was a Ruthenian grammarian. Very little is known about his biography: From 1637 he studied at Cracow University, then in 1643 he was a student of theology at the Sorbonne, Paris. He wrote a Polish ode on the occasion of the marriage of a certain Aleksander Przyłęcki with Ewa Rupniowa, which was printed in 1641. Uzhevych is well known to East Slavic language historians as the author of the first grammar of the Ruthenian language. He wrote his name Іωаннъ Ужевичъ Словянинъ (Ioann Uzhevych Slovyanyn), Ioannes Usevicius Sclavonus, Ioannes Ugevicius Sclavonus, Jan Użewic; in the student register of Cracow University he is written Ioannes Petri Uzewicz, but is today best known as: (Ivan Uzhevich), , (Ivan Uzhevich), (Ivan Uzhevych). Life Very little is known about his biography: From 1637 he studied at Cracow University, then in 1643 he was a student of theology at the Sorbonne, writing is indicated on the cover page. The Grammatica sclavonica Two manuscripts are known of Ivan Uzhevych’s Grammatica sclavonica, written in Latin: The Paris manuscript from 1643 and the Arras manuscript from 1645, called so because of the place it is kept now; no place of writing is indicated on the cover page. Both have been published in a scholarly edition in 1970. Uzhevych’s work, which seems to be influenced by the Polish grammar Polonicae grammatices institutio (1568) by Piotr Stojeński (Petrus Statorius) and by Meletius Smotrytsky’s Church Slavonic grammar Gramatiki slavenskija pravilnoje syntagma (1619), is the only grammar known of the Ruthenian language of the sixteenth and seventeenth centuries, the predecessor of modern Ukrainian and Belarusian, which the author calls lingua popularis, “vulgar tongue”. It is the first grammar of an East Slavic language (and not of Church Slavonic, which Uzhevych calls lingua sacra, “sacred tongue”). Both Belarusian and Ukrainian linguistics have been trying to show that Uzhevych's grammar belongs to the history of their respective language and not the other one. Thus, Ivan Bilodid (1972), Mykhaylo Zhovtobryukh (1976), and Vasyl Nimchuk (1985) have stressed Ukrainian features of his language, whereas Aleksandr Sobolevskiy (1906), Vatroslav Jagić (1907), James Dingley (1972) and Yuriy Shevelov (1979) have pointed out its Belarusian aspects. Olexa Horbatsch (1967) assumes that Uzhevych came from the modern Ukrainian-Belarusian borderlands, which at that time, of course, were not a borderland at all. Uzhevych's grammar includes a lot of parallel forms that