Long since the times of st. Augustin medieval society was firmly convinced of the connection between heresy and the devil, and heretics were often considered members of the „civitatis diaboli“. In the Silesian environment, a similarly constructed religious identity can be more often encountered in the late Middle Ages, when Silesian society was facing the threat of Hussitism. This was reflected in the works of contemporary chroniclers (e.g. Petr Eschenloer, Kaspar Borgeni, Jan Froben etc.). The descriptions of heretics were created in accordance with the already existing Chistian tradition and they predominantly consisted of stereotypes and topoi associated with heresy. The paper will focus on the analysis of narrative strategies used by Silesian chroniclers and will try to explain how they were creating the image of heretics with an emphasis on the role played by the devil in these descriptions – it will analyse the relationship between heretics and the devil.