“The Trier Medallion – Paris, Louvre Museum. Minted in Trier, it depicts a woman – or the genius loci of Londinium – kneeling at the city wall welcoming Constantius Chlorus, who is on horseback, while a galley full of Roman soldiers is sailing up the Thames. Constantius went in London just in time to stop the sack of the city by Frankish mercenaries in 296 CE.”