Flag of the Republic of Venice,  This flag is from a portolan chart attributed to Angelino Dulcert (mid-14th century)
<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>, source: <a rel="nofollow" class="external text" href="https://www.bl.uk/collection-items/portolan-chart-attributed-to-angelino-dulcert">&lt; Portolan chart attributed to Angelino Dulcert &gt; (mid-14th century)</a>