Treaty of Kruschwitz
The Treaty of Kruszwica (German: Vertrag von Kruschwitz), signed on 16 June 1230, was concluded between Konrad I of Masovia and the Teutonic Knights. According to this agreement, the Duke of Masovia transferred to the Teutonic Order the lands of Chełmno. In addition, Konrad I would recognize the independence of the Teutonic Order and its rule over all other conquests made in Prussia and beyond the borders of Poland.
The text is only known by later references, as the original document is not preserved. According to the historian Max Perlbach (1848–1921), the Knights had forged it to create a legal basis for their secular possessions, however Perlbach's thesis has been seriously called into question by modern historians.
- Joseph Gottschalk, Archiv für schlesische Kirchengeschichte, August Lax Verlag, 1976
- Max Perlbach: The oldest Prussian documents. Critically examined, in: Old Prussian monthly. (1873), pp. 609–649.
- Arno Mentzel-Reuters: Max Perlbach als Geschichtsforscher. In: Preußenland. Volume 45 (2007), ISSN 0032-7972, P. 47, referencing Gerard Labuda: Die Urkunden über die Anfänge des Deutschen Ordens im Kulmerland. In: Josef Fleckenstein (Hrsg.): Die geistlichen Ritterorden Europas. Sigmaringen 1980, P. 299–316.
- Dariusz Sikorski, 'Neue Erkenntnisse ueber das Kruschwitzer Privileg' in Zeitschrift für Ostmitteleuropa-Forschung, 51 (2002), p. 317-350