Diocletian. AE Follis. Trier. 307 AD. 

DN DIOCLETIANO PF S AVG, laureate bust right, wearing imperial
 mantle, holding olive branch and mappa
QVIES AVGVSTORVM, Quies standing facing, head left, holding 
branch and leaning on sceptre. 

S-A across fields, mintmark PTR. 

RIC VI Trier 699. Scarce.