Below: Roman emperor Constantius I capturing London after defeating Allectus, illustrated on a medal/coin from the Beaurains hoard). Above: Obverse of gold medal/coin issued by Constantine the Great.
<a href="//commons.wikimedia.org/wiki/User:PHGCOM" class="mw-redirect" title="User:PHGCOM">PHGCOM</a>
Own work by uploader, photographed at the British Museum