EN
The article deals with the problem of authenticity of the document of Gunter the bishop of Plock and the Plock chapter of March 17, 1230 confirming the grant of all the land estates belonging to them and most rights in the Land of Chelmno to the Teutonic Order. Considering the arguments for and against the authenticity of that document, the author concludes that it is indeed false but was based on an authentic document of bishop Gunter and his chapter of March17, 1230. The degree of falsification is, according to the author, minimal because to the list of land estates and rights actually granted to the Order only all tithes from the Land of Chelmno were added, and some corrections were made in order to authenticate the range of that grant. Following the suppositions of M. Perlbach, the author dates the creation of the false document of March17, 1230 to the period immediately preceding the negotiations of the Order with Andrzej, bishop of Plock, which ended with an agreement signed in Parchanie on November 19, 1257.