Can you verify that this is a coin of Constantine the Great. The obverse legend shows (CONSTANTINUSMAXAVG) The reverse has two soldiers with one standard. The chi-rho is in the shield of the standard. The mint mark as I see it is PLG. It appears the legend is the (GLORIA EXERCITUS). [attachment id=0 msg=7538]
Your coin is his son -- Constantine II (RIC VIII Lyons 6)