Didius Julianus. AD 193. AR Denarius (18mm, 2.84 g, 1h). Rome mint. IMP CAES M DID IVLIAN AVG, laureate head right / CONCORD MILIT, Concordia, draped, standing left, holding aquila in right hand and signum in left. RIC IV 1; RSC 2; BMCRE 2-3. VF. Well-centered and struck on good metal.
From the Thomas A. Palmer Collection, purchased from Jonathan Kern, January 1996.
This reverse type reflects the appeal of Didius to the armies within the provinces to follow the lead of the Praetorians in collectively supporting him as emperor. The appearance of this type so early in an emperor's coinage was rather unconventional in the 2nd century, reflective of the urgency of the message, but it was one that would become common among the early issues of the third century military emperors, whose immediate power was directly relative to the support of the legions. For Didius, it was an appeal that was futile, as the provincial armies had already proclaimed for alternates.