Crap. Noticed it only now. The province in Poland should be called Kulmerland, not Culmerland. I mean, yeah, Culmerland is also acceptable, just I think it looks better when spelled with a 'k' - it was a german-cultured province from 13th century onwards.
EDIT: Also, I think we should stick to using one language per region. Therefore, either all province names in Poland should be written in Polish or in latin. So: Mazovia (or Mazowsze), Sandomiria (or Sandomierz), Cracovia/Polonia Minor (or Krakow), Cuiavia (or Kujawy), Gnesna (or Gniezno), Posnania (or Poznan), Lancicia (or Leczyca; the province could also be called Siradia/Sieradz, both cities (Sieradz and Łęczyca) were equally important during the middle ages), and so on. I don't really know which option I would personally prefer, I just know that sticking with one language for the whole region is the way to go.