This paper focuses on Utraquist priest Jan Gaudencius (+ c. 1455), from whose quite extensive library only a parchment Bible copied in 1418 has been preserved. From 1431, when he began to work in Litoměřice, he started using in to note down chronicle records, not only on important events, but also on the weather. Gaudencius and other users of the Bible continued this in the Western Bohemian town of Žlutice.