of Ḥālē. A diocese for Rādhān was set up during the Umayyad period. It belonged to the Province of the Patriarch. Its first known incumbent was Nestorius, who died during the reign of the Patriarch Timothy I (780–823). Following the death of Patriarch Yohannan II in 892, the bishop of Rādhān, also named Yohannan, was initially the leading candidate to replace him, but he lost the election to Yohannan, metropolitan of Mosul. The diocese is included in the list of dioceses compiled by Eliya of Damascus in 893. The diocese of Rādhān still existed in the early 13th century, but by then Christianity in the region was in steep decline. Rādhān was one of only three diocese left in the Province of the Patriarch by the end of the century. Just as the name Rādhān was being replaced in Arabic by Sawād, so it was replaced about this time in Syriac by the name Beth Daron or Beth Dārūn. The final destruction of the Christian community in Rādhān and the lapse of the diocese can probably be dated to the campaigns of Timur (d. 1405). Notes References History of Mesopotamia Historical regions Iraq under the Umayyad Caliphate Iraq under the Abbasid Caliphate Church of the East in Iraq