considered non-canonical, but whose members and clergy may or may not be in communion with the greater Oriental Orthodox communion. Examples include the Celtic Orthodox Church, the Ancient British Church, and lately the British Orthodox Church. These organizations have passed in and out of official recognition, but members rarely face excommunication when recognition is ended. The primates of these churches are typically referred to as episcopi vagantes or vagantes in short. Adherents According to the Encyclopedia of Religion, Oriental Orthodoxy is the Christian tradition "most important in terms of the number of faithful living in the Middle East", which, along with other Eastern Christian communions, represent an autochthonous Christian presence whose origins date further back than the birth and spread of Islam in the Middle East. It is the dominant religion in Armenia (94%) and ethnically Armenian unrecognized Nagorno-Karabakh Republic (95%). Oriental Orthodoxy is a prevailing religion in Ethiopia (43.1%), while Protestants account for 19.4% and Islam - 34.1%. It is most widespread in two regions in Ethiopia: Amhara (82%) and Tigray (96%), as well as the capital city of Addis Ababa (75%). It is also one of two major religions in Eritrea (40%). It is a minority in Egypt (<20%), Sudan (3–5%), Syria (2–3% out of the 10% of total Christians), Lebanon (10% of the 40% of Christians in Lebanon or 200,000 Armenians and members of the Church of the East) and Kerala, India (7% out of the 20% of total Christians in Kerala). In terms of total number of members, the Ethiopian Church is the largest of all Oriental Orthodox churches, and is second among all Orthodox churches among Eastern and Oriental Churches (exceeded in number only by the Russian Orthodox Church). Also of particular importance are the Armenian Patriarchate of Constantinople in Turkey and the Armenian Apostolic Church of Iran. These Oriental Orthodox churches represent the largest Christian minority in both of these predominantly Muslim countries, Turkey and Iran. Internal disputes There are numerous ongoing internal disputes within the Oriental Orthodox Churches. These disputes result in lesser or greater degrees of impaired communion. Armenian Apostolic The least divisive of these disputes is within the Armenian Apostolic Church, between the Catholicosate of Etchmiadzin and the Catholicosate of the Great House of Cilicia. The division of the two Catholicosates stemmed from frequent relocations of church headquarters due to political and military upheavals. The division between the two sees intensified