Enlarge / This Sponsian gold coin, circa 260-c.270 CE, was part of a cache discovered in Transylvania in 1713.The Hunterian, University of Glasgow
In 1713, a cache of Roman coins was discovered in Transylvania, several of which bore the portrait and name of Sponsian—but there are no historical records of a Roman emperor with that name. The coins largely have been dismissed as forgeries for more than a century, but a re-analysis using a variety of physics-based methods has yielded evidence that they might be authentic, according to a recent paper published in the journal PLoS ONE. So Sponsian may
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