The study "The Forgery of the Pledge Charter of Sigismund of Luxemburg for Václav Sekáč of Újezdec from 2nd January 1421" deals with the analysis of the forgery mentioned in the title. It contains the description of the common forms of Sigismund's pledge charters for the church estates and the comparison of the forgery with the original charters. It concludes that the forgery has originated after 1450. There is also the edition of the text in the appendix.