Biernat wrote the first book printed in the Polish language: printed in 1513, in Kraków at Poland's first printing establishment, operated by Florian Ungler—a prayer-book, Raj duszny (Hortulus Animae, Eden of the Soul).
1513 Biernat of Lublin's Raj dusny or Hortulus Animae ((Garden of the Soul), considered the first book printed entirely in Polish.