High Quality Content by WIKIPEDIA articles! Arab Christians are ethnic Arabs of Christian faith, sometimes also including those, who are identified with Arab panethnicity. They are the remnants of ancient Arab Christian clans or Arabized Christians. Many of the modern Arab Christians are descendants of pre-Islamic Christian Arabian tribes, namely the Kahlani Qahtani tribes of ancient Yemen (i.e. Ghassanids, Lakhmids, Banu Judham and Hamadan). During the 5th and 6th centuries the Ghassanids, who adopted Monophosyte Christianity, formed one of the most powerful Arab confederations allied to Christian Byzantium. being a buffer against the pagan tribes of Arabia. The last king of the Lakhmids, Nu`man III, a client of the Sasanian (Iranian) Empire in the late sixth century C.E., also converted to Christianity (in this case, to the Nestorian sect). Citation: ^ Philip K. Hitti, History of the Arabs, 6th ed. (Macmillan and St. Martin`s Press, 1967, pp. 78-84 (on the Ghassanids and Lakhmids) and pp. 87-108 (on Yemen and the Hijaz).