Gratian, AE3 of Nicomedia.

DN GRATIA-NVS PF AVG, pearl diademed, draped, cuirassed bust right.
VIRTVS RO-MANORVM, Roma seated facing on throne, head 
left, left leg undraped, holding globe and reversed spear.
Mintmark SMNA

RIC IX Nicomedia 33.

Image Courtesy of Al Cofribas's collection.