The presented study is devoted to the phenomenon of the counterfeiting activity of Oldřich II of Rožmberk (Rosenberg, 1403-1462), particularly newly discovered forgeries and their interpretations. The motivation to create the forgeries was not ony legitimation of the holding of unjustly seized royal properties, but also the creation of the "image" of a fearless warrior against the Hussite opposition. The author combines diplomatic and historical methods to understand the background of creation of the three groups of forgeries related to the royal castle Zvíkov, the ecclesiastical goods of Svéráz and Zátoň and the trial with the nobleman Jan Smil of Křemže., Přemysl Bar., and Obsahue prameny a odkazy pod čarou