(Urfa). According to the Latin historian Eutropius, the cession of Nisibis was supposed to last 120 years. Nisibis remained a major entrepôt; one of only three such cities of commercial exchange allowed by Roman law promulgated in 408/9. However, despite several Roman attempts to recapture Nisibis through the remainder of the Roman–Persian Wars and the construction of nearby Dara to defend against Persian attack, Nisibis was not returned to Roman control before it was conquered in 639 by the Rashidun Caliphate during the Muslim conquest of the Levant. Under Sasanian rule and after, Nisibis was a major centre of the Christian Church, and the bishop of Nisibis attended the Council of Seleucia-Ctesiphon convened in 410 by the emperor Yazdegerd I (). As a result of this council, the Church of the East was set up, and the bishop of Nisibis became the metropolitan bishop of the five erstwhile Transtigritine provinces. Narsai, formerly a theologian at the School of Edessa, founded the famous School of Nisibis with the bishop, Barsauma, in the 470s. When the Roman emperor Zeno () closed the School of Edessa in 489, the scholars migrated to Nisibis's school and established the city as the foremost centre of Christian thought in the Church of the East. According to the Damascene monk John Moschus, the city's cathedral had five doors in the 7th century, and the monastic and later bishop of Harran, Symeon of the Olives, was recorded as having renewed several ecclesiastical buildings in the early period of Arab rule. The monasteries of the nearby Tur Abdin, led by the reforms of Abraham the Great of Kashkar, founder of the "Great Monastery" of Mount Izla, underwent substantial revival in the years after the Muslim conquest. However, besides the baptistery known as the Church of Saint Jacob (Mar Ya‘qub) and built in 359 by bishop Vologeses, little remains of ancient Nisibis, probably because of ruinous earthquake in 717. Archaeological excavations were conducted in the vicinity of the 4th-century baptistery in the early 21st century, revealing various buildings including the 4th-century cathedral. History Antiquity First mentioned in 901 BCE, Naṣibīna was an Aramean kingdom captured by the Assyrian king Adad-Nirari II in 896. By 852 BCE, Naṣibīna had been fully annexed to the Neo-Assyrian Empire and appeared in the Assyrian Eponym List as the seat of an Assyrian provincial governor named Shamash-Abua. It was under Babylonian control until 536 BCE,