Diocletian, AE antoninianus of Tripolis. AD 284-305. 22 mm, 3.65 g.

IMP CC VAL DIOCLETIANVS AVG, radiate, draped and cuirassed bust right.
IOV ET HERCV CONSER AVGG, Jupiter standing right, holding globe and sceptre, facing Hercules standing left, holding Victory on globe, club and lionskin. 

TR in lower centre. 
Mintmark palm branch XXI. 

RIC V-2. 327.

With permission of VAuctions Auction 326, Lot 528, Sept. 2017.