Valens. AE3. Rome. 364-367 AD. 

DN VALEN-S PF AVG, pearl diademed, draped, cuirassed bust right

GLORIA RO-MANORVM, emperor advancing right, holding 
labarum and dragging captive behind him. 

Mintmark RT. 

RIC IX Rome 15b, type vii. Rare.

Courtesy of Roma Numismatics, Feb, 2010