The Coptic church is an offshoot of the ancient Egyptian Christian church, one of the oldest Christian churches. In 451 the Copts split from the Catholic church after the Council of Chalcedon, following the Monophysite ("one nature") doctrine of the nature of Christ. The Coptic church is the by far largest Christian group in both East as well as North Africa/Middle East, with over ten million adherents. The name "Copt" ( gupt in Arabic) is derived from Ayguptos - the Greek word for Egypt.
(Ar., Qibt): term derived from the Greek Aigyptoi, a derivation of the word Hikuptah, House of the Energy of Ptah, the religious epithet for the ancient city of Memphis. The term now refers to the indigenous Christian population of Egypt.