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CONSTANTINE I 'THE GREAT '- Roman Emperor: 307-337 A.D. -
Centenionalis (23 mm, 2.85gm.)  Siscia,  315-316 A.D.
Reference: RIC VII 15,B.2. Rare, page 424 - British  Museum.
IMP CONSTANTINVS P F AVG - Laureate head right.
IOVI CONS-ERVATORI - Jupiter standing left, holding Victory on a globe and  scepter; an eagle with wreath
in its beak, left., ˖ SIS ˖ B.