Polish-ruled Prussia ("royal") vs. Brandenburg-ruled Prussia ("ducal") down to the partition of 1772.
<a href="https://en.wikipedia.org/wiki/User:Sk%C3%A4pper%C3%B6d" class="extiw" title="en:User:Skäpperöd">Skäpperöd</a> at <a class="external text" href="https://en.wikipedia.org">en.wikipedia</a>
2008-06-21
Transferred from <a class="external text" href="https://en.wikipedia.org">en.wikipedia</a><br>(Original text : <i><a href="https://en.wikipedia.org/wiki/image:K0nigl%2BherzoglPreussen.png" class="extiw" title="en:image:K0nigl+herzoglPreussen.png">:image:K0nigl+herzoglPreussen.png</a></i>)