Constantius II, AE follis, Rome.

DN CONSTANTIVS PF AVG, pearl-diademed, draped, cuirassed bust right.
FEL TEMP-REPARATIO, soldier spearing a fallen horseman, who is bare-headed, reaching backwards. 
Mintmark RS palm branch. 

RIC VIII Rome 282/304.

Dane's collection, March, 2017.