Double Cross of the <a href="https://en.wikipedia.org/wiki/Jagiellonian_dynasty" class="extiw" title="w:Jagiellonian dynasty">Jagiellonian dynasty</a> from the <i>Codex Bergshammar</i>, dating to ~1440.
Unknown author<span style="display: none;">Unknown author</span>
circa 1440 <div style="display: none;">date QS:P,+1440-00-00T00:00:00Z/9,P1480,Q5727902</div>
<a rel="nofollow" class="external text" href="https://sok.riksarkivet.se/bildvisning/R0001216_00060#?c=&amp;m=&amp;s=&amp;cv=59&amp;xywh=-620%2C-153%2C5126%2C2835">Sok.riksarkivet.se</a> (page 112 in the actual book; page 60 in the online version)