Abstract
This article contains analysis of two songs by Petrus Wilhelmi de Grudencz (1392 - after 1452) preserved in many Central European sources: Prelustri elucencia and Probleumata enigmatum. These songs were published by Jaromír Černý (1993).
Based on new findings concerning the dating of these sources and availing himself of newly discovered copies, the author reconstructs the original versions of these two compositions and discusses the process of their transformation during the fifteenth and sixteenth centuries. He points to the different Catholic and Utraquist traditions and also to the lack of uniformity in the redaction of songs preserved in Utraquist manuscripts.