<a href="https://en.wikipedia.org/wiki/Wilhelm_Kettler" class="extiw" title="w:Wilhelm Kettler">Wilhelm Kettler</a> (1574-1640). Duke of Courland and Semigallia.
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Unknown author<span style="display: none;">Unknown author</span> (probably Joachim Zivert)</div>
<a rel="nofollow" class="external autonumber" href="http://www.archiv.org.lv/hercogiste/index.php?lang=lv&amp;id=17">[1]</a>. Photo from the collections of Rundāle Palace Museum.