Nieznane plany Grudziądza z XVII wieku w zbiorach szwedzkich

During the „Swedish invasion” from 1655–1660, the turmoil of war also affected Grudziądz. The Swedish army conquered the city in December 1655 and occupied it until August 1659. For some time, the castle was even the headquarters of King Charles X Gustav. During those few years, about ten plans, maps and sketches of Grudziądz were created, made by E. Dahlberg, G. Gorgas and A. Loffmann in 1656. Six of them, never presented in literature, are included in this article. Currently they are in the collection of the National Archives of Sweden – Riksarkiviet. They were supposed to glorify Swedish gains during the war with Poland (city views) and were a valuable cartographic source for planned fortification projects in the event of defense against the Polish army. Three engravings with a view of the city refer directly to the previously known plan of the siege of Grudziądz by the Swedes, published in the Pufendorf atlas in 1696. Two of them deserve special attention because they depict the city on one sheet (top view, bottom plan). The next three city plans refer to the latest chronologically (1657) plans of A. Loffmann. Although the first of them is not signed, the nature of the letter allows us to suppose that it was created by e. Dahlberg, the same, who authored another plan of 1656. The last one included in the article is the Gorgas plan, so far known only from the description. Gorgas was also the creator of the next plan of 1657, which is available online. Therefore, the source base regarding the cartography of Grudziądz from 1656–1657 is rich and supposedly the following years will bring about more discoveries in the Swedish archives.