IMP CONSTANTINVS PF AVG, laureate head right. / IOVI CONSERVATORI, Jupiter standing left, holding Victory on globe and leaning on sceptre, eagle at foot left with wreath in its beak, officina Γ to right. Mintmark dot SIS dot. 22.5 mm, 3.07 grams. Siscia mint, minted 315-316 AD. RIC VII 15.

Constantine the Great (c. 272–337 CE) was a Roman emperor who ruled from 306 to 337 CE and is best known for being the first Roman emperor to convert to Christianity. Rising to power after the death of his father, Constantius I, Constantine secured his position through a series of civil wars, culminating in his victory over Maxentius at the Battle of the Milvian Bridge (312 CE)—an event he famously attributed to divine guidance. As emperor, he enacted significant reforms, strengthened the empire, and ended the persecution of Christians through the Edict of Milan in 313 CE. He also founded Constantinople (modern Istanbul) as a new eastern capital, laying the foundation for the Byzantine Empire. Constantine's reign marked a turning point in Roman and Christian history, earning him lasting recognition as a transformative and influential ruler.