To spread the new Protestant faith in Prussia, Duke Albrecht commissioned the translation and publication of Lutheran texts in Old Prussian and Lithuanian. In the year 1547, while still a student in Königsberg, Mažvydas and his collaborators compiled and published the first printed Lithuanian book "Catechismusa Prasty Szadei" ("The Simple Words of Catechism"), which was based on the Polish version of Martin Luther's "Kleiner Katechismus", thus launching literature and book printing in Lithuanian. This book shows characteristics of the Samogitian dialect of Lithuanian, with clearly visible Aukštaitian traits. It was printed at about the same time as the first books in neighbouring nations' languages: Polish in 1513 or 1514, Belarusian in 1522, Estonian in 1535, and Latvian in 1585.