Listy senatorów koronnych do margrabiego Jerzego Fryderyka i nadradców pruskich w okresie trzeciego bezkrólewia (1586–1587)
There are in the Geheimes Staatsarchiv Preußischer Kulturbesitz in Berlin original letters written by Poles to the government of the Duchy of Prussia; eight of them were written by Crown senators to Margrave George Frederick and Prussian councillors-general during the third interregnum (1586–1587). The subject of the article is the edition of the abovementioned letters and their presentation in the context of Polish-Prussian relations.
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