The name Greek Orthodox Church (Monotonic Greek: Ελληνορθόδοξη Εκκλησία, Polytonic: Ἑλληνορθόδοξη Ἑκκλησία, Ellinorthódoxi Ekklisía, ) is a term referring to the body of several Churches within the larger communion of Eastern Orthodox Christianity, whose liturgy is or was traditionally conducted in Koine Greek, the original language of the New Testament. Today, several of these Churches conduct their services in Arabic, the common language of most Greek Orthodox believers in the Levant, while at the same time maintaining elements of Greek cultural tradition. The current territory of the Greek Orthodox Churches more or less covers the areas in the Balkans, Anatolia, and the Eastern Mediterranean that used to be a part of the Byzantine Empire. The origins of the Orthodox Church can be traced back to the churches which the Apostles founded in the Balkans and the Middle East during the first century A.D., and it maintains many traditions practiced in the ancient Church. Greek Orthodox Churches, unlike the Catholic Church, have no Bishopric head, such as a Pope, and hold the belief that Christ is the head of the Church. However, they are each governed by a committee of Bishops, called the Holy Synod, with one central Bishop holding the honorary title of “first among equals.” Greek Orthodox Churches are united in communion with each other, and with the other Eastern Orthodox Churches. The Eastern Orthodox hold a common doctrine and a common form of worship, and they see themselves not as separate Churches but as administrative units of one single Church. They are notable for their extensive tradition of iconography (see also: Byzantine art), for their veneration of the Mother of God and the Saints, and for their use of the Divine Liturgy on Sundays, which is a standardized worship service dating back to the fourth century A.D. in its current form. The most commonly used Divine Liturgy of the Orthodox Church was written by Saint John Chrysostom (347–407 A.D.).