This is also confirmed by the written sources, specifically in the "Chronicle Żagań Abbots" (Kronika opatów żagańskich), where he is defined as a pious man.
Together with the Bohemian leader Bernard Szumborski (Bernhard von Zinneberg) he fought in the Battle of Chojnice, where the Poles suffered a complete defeat.
Rudolf didn't survive the battle: he died on 17 September 1454[1] in his initial phase, facing the charge of the strong Polish cavalry.
After his death without issue (he never married), his older brother Balthasar assumed the full sovereignty over Żagań.
This unilateral decision left their younger brother Jan II bitterly disappointed and caused later his further revolts against Balthasar.