Constantius I, AE half-follis, Siscia. 317-318 AD

DIVO CONSTANTIO PIO PRINCIPI, Laureate and veiled head right.
REQVIES OPTIMORVM MERITORVM, Constantius seated left on curule chair, raising arm and holding sceptre.
Mintmark SIS.

RIC VII Siscia 42, rated R3.

Contributed by P. Tremblay, March 2011.

This issue was from a trio of coins struck at the mint of Siscia in 317-318 under the auspices of Constantine I and Licinius Sr.. 
The three former imperors thus honoured were Constantius I 
(father of Constantine I) depicted here, Maximianus, and Claudius II.