Maximianus AE16 quinarius. AD 286-305. 1.42 g. 

IMP MAXIMIANVS P AVG, Laureate, cuirassed bust right.
IOVI CONSERVATORI, Jupiter standing left, holding 
thunderbolt and sceptre.

RIC V-2 283 Siscia var (listed only for Diocletian).

Contributed by "quadrans" of the Forum Ancient Coins, August 2013