You may be right, but it could also be Valentinian II, possibly RIC 31:
Thessalonica, 375-378 AD., AE 18mm. DN VALENTINI-ANVS PF AVG, pearl diademed, draped, cuirassed bust right / GLORIA RO-MANORVM, emperor advancing right, holding labarum and dragging captive behind him. Left field: M; Right field: star over Gamma; Mintmark: TES.
Thessalonica, 375-378 AD., AE 18mm. DN VALENTINI-ANVS PF AVG, pearl diademed, draped, cuirassed bust right / GLORIA RO-MANORVM, emperor advancing right, holding labarum and dragging captive behind him. Left field: M; Right field: star over Gamma; Mintmark: TES.




















