Valentinian I, AE3, Siscia.

DN VALENTINI-ANVS PF AVG, pearl diademed, draped, cuirassed bust right.
GLORIA RO-MANORVM, Emperor in military dress, advancing right, 
head left, holding labarum, dragging captive behind him. 
Left field: S
Right field: star over F. 
Mintmark: BSISC. 
RIC IX Siscia 14a, type xv.

With permission of dirtyoldcoins.com. 2005