Karte der Mark Brandenburg um 1320
<a href="https://de.wikipedia.org/wiki/User:Chumwa" class="extiw" title="de:User:Chumwa">Maximilian Dörrbecker</a> (<a href="https://de.wikipedia.org/wiki/User:Chumwa" class="extiw" title="de:User:Chumwa">Chumwa</a>)
GFDL
<span class="int-own-work" lang="en">Own work</span>, using <a href="//commons.wikimedia.org/wiki/File:MarkBrandenburg.png" title="File:MarkBrandenburg.png">this file</a> by <a href="https://de.wikipedia.org/wiki/Benutzer:Captain_Blood" class="extiw" title="de:Benutzer:Captain Blood">Captain Blood</a> as basis