Section of a portolan map by Angelino Dulcert (Dalorto), dated ca. 1325, depicting the flag of the Second Bulgarian Empire. Scan found on the website of the National Library of Australia: <a rel="nofollow" class="external free" href="https://nla.gov.au/nla.obj-233481045/view">https://nla.gov.au/nla.obj-233481045/view</a>
Angelino Dulcert
1325
<a rel="nofollow" class="external free" href="https://nla.gov.au/nla.obj-233481045/view">https://nla.gov.au/nla.obj-233481045/view</a>