Karelsprivilege is a legendary privilege that Charlemagne allegedly paid to the Frisians led by Magnus Forteman to thank them for the support that was given to his attack on Rome.
Medieval literature mentioned a link between the Frisian eagle as a heraldic charge in coats of arms and the Karelsprivilege.
Other names used for this charter are: Magnuskerren, Friezenprivilege, Vrijheidsprivilege, Libertas Frisonica or Previlegii Frisiorum Caroli Magni.
One of Charlemagne's first steps after the conquest of the Saxons was enumerating the local customs For Frisia that meant the codification of the Lex Frisionum.
Although the existence of the privilege has been challenged, the Frisian Countries up to the beginning of the sixteenth century developed in a unique way, without the feudal system introduced by Charlemagne in other areas of Western Europe.