Coat of arms of the Duques of Porto. Based off of <a href="//commons.wikimedia.org/wiki/File:Armas_primeiro_infante_portugal.png" class="image"><img alt="Armas primeiro infante portugal.png" src="https://upload.wikimedia.org/wikipedia/commons/6/6d/Armas_primeiro_infante_portugal.png" decoding="async" width="1232" height="2153" data-file-width="1232" data-file-height="2153"></a> and using <a href="//commons.wikimedia.org/wiki/File:Coat_of_Arms_of_the_Prince_of_Portugal_(1481-1910).png" class="image"><img alt="Coat of Arms of the Prince of Portugal (1481-1910).png" src="https://upload.wikimedia.org/wikipedia/commons/8/83/Coat_of_Arms_of_the_Prince_of_Portugal_%281481-1910%29.png" decoding="async" width="1222" height="2170" data-file-width="1222" data-file-height="2170"></a>
<a href="//commons.wikimedia.org/wiki/User:Lumastan" title="User:Lumastan">Lumastan</a>
<span class="int-own-work" lang="en">Own work</span>