Once the Romans occupied the whole of North Africa, the city of Igilgili was administratively attached to the Roman province of Christian in the fourth century, with the formalization of this religion under Emperor Constantine, although the first conversions date back to two centuries earlier.
Once the Romans occupied the whole of North Africa, the city of Igilgili was administratively attached to the Roman province of Mauretania Caesariensis and later to the one of Mauretania Setifensis. Igilgili population and its surroundings became massively Christian in the fourth century, with the formalization of this religion under Emperor Constantine, although the first conversions date back to two centuries earlier.