Central Europe in Carolingian times
<a href="//commons.wikimedia.org/wiki/Johann_Gustav_Droysen" title="Johann Gustav Droysen">Johann Gustav Droysen</a>
<a rel="nofollow" class="external text" href="https://archive.org/download/DroysensHistoricalAtlas1886">Allgemeiner Historischer Handatlas</a>