The subject of the article is the establishment of the legal basis and conditions for the transformation of the
Prussian part of the Teutonic Order’s state, previously under theocratic authority, subjected to Polish sovereigntly
under the Peace of Thorn from 1466, into the secular duchy which, after the Treaty of Kraków in 1525 became
a fiefdom of Poland, as well as discussing the legal nature of the transformation and the manner in which it was
implemented.
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