Constantine I (307-337). AE Follis, Lugdunum mint, 314-315. Obv. IMP CONSTANTINVS PF AVG. Laureate, draped and cuirassed bust right. Rev. MARTI CONSERVATORI. Mars standing facing, head right, holding inverted spear and resting hand on grounded shield; T - F in fields; in exergue, PLC. RIC VII 10. 3.1 g. Ø 21 mm. RR. Very rare and good. Brown patina. Good VF.