Search for: [Abstract = "In XIV c. Silesia went back under the Czech crown, Germany approving. Thus, in order to make the argument stronger, the introductory part of this paper \(Part l\) presents shortly those document sources which confirm Germany's rights of superiority over Silesia in XIII\-XIV c. and the Piasts' consent to enter a vassal relationship with German and Czech rulers\- and so become the dukes of the Reich, just as it also happened after the rebirth of the Polish Kingdom by the Kujawian lineage of the Piasts' relatives \(Władysław Łokietek, Kazimierz Wielki\)."]