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Imagined archival research; documents are illustrative.
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Traktat obronny Ferdynanda III i Jana Kazimierza, Wiedeń 1656
Traktat obronny Ferdynanda III i Jana Kazimierza, Wiedeń 1656, Szukaj w Archiwach / Archiwa Państwowe
- URL
- https://www.szukajwarchiwach.gov.pl/de/jednostka/-/jednostka/17706260 (accessed 2026-09-26)
Archive description of the original treaty with Emperor Ferdinand III.