<i>The Oath of Viriathus</i>, c. 1798-9, by Vieira Portuense. In the collections of the Ricardo do Espírito Santo Silva Foundation, Lisbon, Portugal.
<bdi><a href="https://en.wikipedia.org/wiki/en:Vieira_Portuense" class="extiw" title="w:en:Vieira Portuense"><span title="Portuguese painter">Vieira Portuense</span></a>
</bdi>
c. 1798-9
<a rel="nofollow" class="external text" href="https://www.fress.pt/pecas/juramento-de-viriato/">Fundação Ricardo do Espírito Santo Silva</a>