The fourth century Christian basilica at Zebed was built of mud-bricks. It was a monastery church as indicate the surrowndings. C.H. Butler expedition in Syria have found an Syriac inscription "Rabula made the throne". The Zebed monastery should be that one mentioned in a Rabbula the bishop of Edessabiographical Syriac text.
Sources:
- Howard Crosby Butler: Early Churches in Syria. Fourth to Seventh Centuries. Princeton University Press, Princeton 1929, p. 39
- Jan Willem Drijvers, The Protonike Legend, the Doctrina Addai and Bishop Rabbula of Edessa, in: Vigiliae Christianae, vol. 51, no. 3, 1997, pp. 298–315