This article re‐examines the ceramics of SBY‐9, a church and monastery site on the island of Sir Bani Yas, Abu Dhabi emirate, U.A.E. It then explores other archaeological evidence for Christianity in the Arabian Gulf and compares it to the textual data, resulting in a reconsideration of the history and activities of the Church of the East. The pottery of SBY‐9 indicates that the monastery complex was occupied some time between the second half of the seventh century and the mid‐eighth century AD and not, as previously believed, the sixth–seventh centuries AD. Other excavated churches and monasteries in the Gulf region should also be redated to the eighth and ninth centuries AD (al‐Qusur, Kharg). These findings cast a new light on the history of Christianity in the Arabian Gulf after the Muslim conquest.