Merkelis Petkevičius

Merkelis Petkevičius (; 1550–1608) was a Reformation (Calvinist) activist in the Grand Duchy of Lithuania. He was a nobleman who worked as a court scribe in Vilnius for almost thirty years. In 1598, he published the first Lithuanian-language Protestant book printed in the Grand Duchy of Lithuania (the first Lithuanian Protestant book was printed in Konigsberg in 1547 by Martynas Mažvydas). This book, a bilingual catechism in Polish and Lithuanian, was published in response to the publication of the Roman Catholic catechism of Mikalojus Daukša.