Were Bohemus and haereticus used as synonymous designations?

This article discusses the terms used in medieval text sources to denote the Hussites. It pays particular atten-tion to the nominal phrase Bohemi heretici arguing that its lexeme constituents functioned in fifteenth-cen-tury Latin as synonyms. A more detailed examination focuses on types of synonymy established between two mentioned lexemes. The terms contextual synonymy and partial synonymy are used here. In addition, the importance of connotative meaning is pointed out as a criterion for analysing the usage of lexemes refer-ring to Bohemia and the Bohemian people in the context of the Hussite heresy. The study is based on let-ters written by Polish secular and ecclesiastical chanceries as well as those written to Polish sovereigns and dignitaries by their foreign correspondents. In addition, the “Annals”of Jan Długosz are taken into account.