The term Greek Orthodox Church refers to churches within the larger communion of Eastern Orthodox Christianity sharing a common tradition whose liturgy is also traditionally conducted in Koine Greek, the original language of the New Testament.
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The churches where the Greek Orthodox term is applicable are:
The four ancient Patriarchates:
Two national autocephalous churches:
As well as:
And four eparchies of the Ecumenical Patriarchate of Constantinople:
The Orthodox Church of Albania, whose liturgy is carried out in Koine Greek only in certain areas of Albania, has also been described as the Greek Orthodox Church of Albania, however this has become complicated by tensions between the Greek and Albanian governments over the ethnic Greek minority in Albania, the majority of which happen to be followers of the Orthodox Church.
Historically, the term Greek Orthodox has also been used to describe all Eastern Orthodox Churches, because the word "Greek" in the phrase "Greek Orthodox" is used to refer to the Greek heritage of the Byzantine Empire because during 8 centuries of Christian history most intellectual, cultural, and social developments in the Christian church took place within the Empire or in an area of its influence, thus, most parts of the liturgy, traditions, and practices of the church of Constantinople were adopted by all followers and still provide the basic patterns of Orthodoxy now days. However, the term Greek Orthodox was abandoned by Slavic and other national orthodox churches, who had proceeded to assist to the purposes of their peoples national awakenings, from as early as the 10th century A.D.