Diocletian and Constantius I, AE 32mm medallion, 15.27 gr. ca. 295-305 AD, Trier. 

DIOCLETIANVS AVG ET CONSTANTIVS NOB C, radiate and cuirassed
bust of Diocletian right, facing radiate and cuirassed
bust of Constantius I left.

VIRTVS EXERCIT IMPER ROMANI, Mars walking right, holding
trophy over shoulder, and shield, dragging a bearded, bound
captive behind him.
Mintmark PTR.

Gilles, Trierer Petermännchen 1 (this coin) otherwise unpublished.

Note: K.-J. Gilles suggested that the medallion was struck
to commemorate Carausius' recovery, in Summer 293 AD, of 
Boulogne, which had been under Carausius' control, thus
recovering also the central government of Northwest Gaul. 
However, it could have been struck to celebrate the Decennalius
of Caesars Constantius and Galerius in 302 AD, or the 
Vicennalius of Diocletian and Maximianus the year after,
in which case the reverse would depict the numerous battles
of Constantius I between 300-305 AD, against German tribes 
along the Rhine border and which ended in success due to 
the courage of his soldiers, as reflected in the reverse legend.

Contributed by Dr. Hubert Lanz, auction November 2000, 
Added July 2011.