Constantius I AE3. Posthumous Issue. 317-318 AD. 

Obv: DIVO CONSTANTIO PIO PRINC, veiled & laureate head right
Rev: MEMORIAE AETERNAE, eagle standing right, looking left, 
wings spread, RQ in ex. 

RIC VII Rome 111, rated R3.

With permission of Roma Numismatics, June 2009