In Czech historiography Queen Kunhuta has been quite neglected. Her figure has not been investigated in monographs or specific studies. She can be somehow included within the group of defamed queens, which is especially rich in the Middle Ages. This negative image of the queen finds its origin in medieval chronicles, which blamed Kunhuta for her love affair with Záviš of Falkenštejn, who was accused of being one of the promoters of the defeat of Otakar II. Kunhuta's negative portrayal has been very stable and despite its rehabilitation in the most recent studies, it probably influenced scholars' disinterest in the part she performed as a political agent. The documentary material preserved shows that her active role in Bohemian society of the thirteenth century deserves more attention. She was involved in various administrative and political tasks. The first chapter of the thesis should provide an approach to the study of the queen, which mediates between a partial point of view and Kunhuta's multi-faceted image. It should introduce a figure to whom is linked a letter collection, which represents the main theme of the present dissertation (i.e. the letter collection of master Bohuslav, probably a chaplain and notary of the queen). The analysis and the critical edition of the source can be found in...