War banner of the old Prussians depicting <a href="https://en.wikipedia.org/wiki/Peckols" class="extiw" title="w:Peckols">Patollus</a>, <a href="https://en.wikipedia.org/wiki/Perk%C5%ABnas" class="extiw" title="w:Perkūnas">Percunus</a> and <a href="https://en.wikipedia.org/wiki/Potrimpo" class="extiw" title="w:Potrimpo">Potrimpus</a>, and coat of arms of the Prussian king Waidewuti
Christoph Hartknoch
1684
Christoph Hartknoch: <i>Alt- und neues Preussen</i>, Frankfurt and Leipzig 1684, p. 226. <a rel="nofollow" class="external free" href="http://www.museumkoenigsberg.de/Geschichtliches.html">http://www.museumkoenigsberg.de/Geschichtliches.html</a>