 | This article needs additional citations for verification. (January 2020) |
Jancko Douwama was a Frisian nobleman who fought to free Friesland from foreign rule during the Vetkopers and Schieringers conflict, the Saxon feud and the Guelders Wars.
| This article needs additional citations for verification. (January 2020) |
Jancko Douwama was a Frisian nobleman who fought to free Friesland from foreign rule during the Vetkopers and Schieringers conflict, the Saxon feud and the Guelders Wars.