Marches Cham and Nabburg, installed by the Emperor of the Holy Roman Empire repective German King. They were part of the  system of marches created by Charlemagne.
<a href="//commons.wikimedia.org/wiki/User:Willi_P" title="User:Willi P">Willi P</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>, Grenzen der Herzogtümer und ihrer Gaue nach Gustav Droysen, 1886, Grenzen nach Karl Bosl, 1976