"... took to holy marriage their sister's daughter". Marginalia to the genealogy of Silesian princes and to the fate of Krnov Duchy at the turn of the 15th and 16th century
The analysis of the sources from the end of the 15th and the beginning of the 16th century. The author specifies on its grounds present state of knowledge about the history of the Duchy of Krnov, which was definitively constituted in that time.