Marcus Silbannacus was a usurper during the reign of Philip I. History has not been kind to Silbannacus since it has failed to record his existence. Silbannacus is known only from a single coin which noe resides in the British Museum. Silbannacus most likely led a very short lived rebellion around 248 AD on the Rhine perhaps about the same time period as Pacatian in the Balkins. He was most likely killed by his own troops since there is no record of a confrontation between himself and Philip I.
IMP MAR SILBANNACVS AVG
Note: The style of this unique coin and its fabric places its time of mintage to the regin of Philip I.