House of Bernadotte
Eggenberg, Biron or Wrede families that rose to the rank of "Fürst" (prince). On a European level, there are some more examples for royal or princely families who only rose to nobility after the middle age, such as the House of Bonaparte (and other Napoleonic families like the House of Bernadotte, the Ney, Murat, Fouché d'Otrante, Berthier of Wagram etc.), the Italian princes Torlonia or the Russian princes Demidov.