It is easy to put a border around this flag image
See <i><b>File history</b></i> below for details.
<b>1442-1516</b>
see <a href="https://meta.wikimedia.org/wiki/Image:Alfonsino_oro.jpg" class="extiw" title="m:Image:Alfonsino oro.jpg">Carlino</a> and <a rel="nofollow" class="external autonumber" href="http://www.delacuadra.net/escorial/jr-heral.htm">[1]</a>. See also: <a href="//commons.wikimedia.org/wiki/File:Tavola_Strozzi_-_Napoli.jpg" class="image"><img alt="Tavola Strozzi - Napoli.jpg" src="https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Tavola_Strozzi_-_Napoli.jpg/150px-Tavola_Strozzi_-_Napoli.jpg" decoding="async" width="150" height="48" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Tavola_Strozzi_-_Napoli.jpg/225px-Tavola_Strozzi_-_Napoli.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Tavola_Strozzi_-_Napoli.jpg/300px-Tavola_Strozzi_-_Napoli.jpg 2x" data-file-width="3543" data-file-height="1142"></a> (<i>Tavola Strozzi</i>, 1472)