Banner of Sigismund III Vasa. This flag Made during the period 1601-1621.
<a href="//commons.wikimedia.org/wiki/User:Samhanin" title="User:Samhanin">Samhanin</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>, sources: <a href="//commons.wikimedia.org/wiki/File:Kung_Sigismund_III_polska_huvudban%C3%A9r_1601-1621.jpg" title="File:Kung Sigismund III polska huvudbanér 1601-1621.jpg">Kung Sigismund III polska huvudbanér 1601-1621.</a><br><a rel="nofollow" class="external text" href="http://www.angelfire.com/mi4/polcrt/PolMilitary.html">angelfire.com, 'Military Banners' part.</a>