Zarai was near the Fossatum Africae, that marked the border between the Roman controlled Africa and the barbarian tribes. East of the Fossatum there was a partial Latinisation of the society
The ruins of Zaraï are called "Henshir Zraïa" and are found inside the municipality of Ain Oulmene. They lie to the south-east of Setif in Algeria, crowning an eminence which overlooks all the country on the left bank of the Oued Taourlatent, known to the medieval Arabs as Oued Zaraoua.[7]
History
Zarai was protected after emperor Hadrian started the construction of a wall similar to the one with his name in Roman Britannia, by one of the sections of the Fossatum Africae: the Hodna or Bou Taleb section. This section begins near the north-east slopes of the Hodna Mountains, heads south following the foothills then east towards Zaraï, and doubles back westward to enclose the eastern end of the Hodna mountains, standing between them and the Roman settlements of Cellas and Macri. The length of this segment is about 100 km. It probably criss-crossed the ancient border between Numidia and Mauretania Sitifensis.
The frontier post stood at Zarai, the limit in this direction of the area for which the Third Augustan Legion was responsible. Zarai became a Roman town, of which considerable remains have survived. About 213 A.D. it ceased to be garrisoned, probably because the land round about had become peaceful, though it was still exposed to occasional raids from the desert. The district between Lambaesis and Zarai has preserved many traces of communities founded by veteran soldiers, who turned to agriculture after their service was over.... From Zarai two great routes ran into Mauretania, one proceeding in a north-westerly direction, and passing through the important city of Sitifis, the other taking a southerly line. Both roads met at Auzia (Aumale in Algeria). They ran through districts which were to a large extent occupied by estates of the emperors. -- James Reid
The Byzantines fortified the city as the western border town of their possessions in Africa. The small city of Zarai disappeared.
Ruins
Remains of a Byzantine citadel and of two Christian basilicas are still visible.[8]
Religion
Zarai was the seat of a Christianbishopric. It was one of the key cities of the Donatist controversy. The remains of a Byzantine citadel and of two basilicas are still visible.[7] Three bishops of Zaraï are known from antiquity. The see fell into abeyance after the Islamic conquest of the Maghreb but was later revived by the Roman Catholic Church as a titular see.
This article incorporates text from a publication now in the public domain: Herbermann, Charles, ed. (1913). "Zarai". Catholic Encyclopedia. New York: Robert Appleton Company.
Head, Barclay; et al. (1911), "Numidia", Historia Numorum (2nd ed.), Oxford: Clarendon Press, pp. 884–887.
Reid, James. The Municipalities of the Roman Empire. University of London. London, 1913 (reprint. ISBN9781107683082)
P. Trousset (2002). Les limites sud de la réoccupation Byzantine.Antiquité Tardive v. 10, p. 143–150.