Constantius II. AE3. Antioch. AD 337-361. 

DN CONSTANTIVS PF AVG, pearl-diademed, draped and cuirassed bust right.
FEL TEMP RE-PARATIO, soldier standing left, spearing 
fallen horseman who has falling forwards, clutching the horse's neck.

Gamma in left field
Mintmark AN AI.

RIC VIII Antioch 135. 

With permission of Auktionshaus H. D. Rauch GmbH auction 107, Lot 460, Nov. 2018.