The suggestion of Carausius' existence comes exclusively from the study of approximately twenty extant coins, all of which were found in the United Kingdom.
[2] Evans suggested that this coin, bearing the garbled legend DOMINO CARAVƧIO CEƧ, represented that of a junior emperor reigning sometime in the 5th century AD.
Specifically, Evans suggested that Carausius II may have controlled Britannia while the incumbent Constantine III was in Hispania, suppressing the revolt of Gerontius and Maximus in 409 AD.
Furthermore, Sutherland noted that the imperial title of Caesar fell out of common usage following the reign of Julian, far before the suggested dating of 409 AD.
John Kent refuted this claim in a paper published the following year, stating that the unique coin that Stevens had cited was not genuine.