Marchionatus Brandenburgicus / authore Olao Iohannis Gotho, Gustavi Mag. R.S. Cosmographo. https://www.rawpixel.com/image/9199024/image-vintage-public-domain-mapsFree Image from public domain licenseA medieval ship flag captured from a Danish ship by forces from Lübeck in 1427 displaying the arms of Denmark, Sweden… https://www.rawpixel.com/image/8324950/image-art-vintage-public-domainFree Image from public domain license