The Diocese of Adana and Tarsus, the purview of which almost coincided with that of the Adana and Tarsus vilayet, belonged to the Patriarchate of Antioch.

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The history of the Diocese of Amaseia from the 15th century until the exchange of populations. Through the history of the diocese, information on the economy, population and cultural life of the region is also provided.

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The predecessor of the ecclesiastical administration of Anea was the namesake bishopric of the Byzantine period, which remained inactive after the Turkish expansion to western Asia Minor. It was revived in the 19th century, when the bishopric of Crene and Anea was established in 1802. The part of Anea became later a separate bishopric under the diocese of Ephesus, and was promoted to a diocese of its own in 1906 .

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Ankara was one of the cities where Christianity was spread already from the years of the Apostles. Although the presence of a bishop in the area was not constant, causing problems from time to time, the city was indeed the seat of a bishop, with short breaks, already from the 15th century. While the presence of the Orthodox element in the early Ottoman centuries seems to be weak, it was strengthened from the 18th century onwards due to migration from Cappadocia.

The Diocese of Caesarea was established in the early Christian period as the first in hierarchy as well as in status among the metropolises of the Patriarchate of Constantinople. The diocese declined in the 14th century and ceased to operate in the 15th and 16th century. Nevertheless, it gradually became again one of the most important dioceses in Asia Minor. The ecclesiastical history of the city of Kaisareia contributed to it being selected as the seat of the Turkish Orthodox patriarchate,...

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The Diocese of Cerasous (Kerasounta) survived until the late 17th century. From then onwards the area of its jurisdiction was at first a patriarchal exarchy, while later it was divided between the dioceses of Trebizond and Chaldia.

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The establishment of the diocese of Chaldia is closely related with the development of mining activity in the region. The diocese of Chaldia is a unique case of ecclesiastical admininstration, since its jurisdiction went beyond the borders of a fixed territory and included mining regions all over Asia Minor.

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The diocese of Chalkedon was one of the oldest of Asia Minor, as Chalkedon was an important ecclesiastical centre already from the Early Byzantine Period. The Greek-Orthodox population of the area was exempted from the population exchange between Greece and Turkey in 1923. As a result, the diocese remained one of the very few active Greek-Orthodox ecclesiastical provinces in Turkey.

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The existence of the bishopric of Nicopolis and Colonea, dependant on the diocese of Neocaesarea, can be dated to 1855. Between 1887 and 1907, this new ecclesiastical authority was extracted from the diocese of Neocaesarea and promoted to diocese. The interesting fact about this particular diocese is that it expressed its request for separation from the diocese of Neocaesarea even though it was positioned very near its seat (Kotyora). Moreover, the newly founded province of Nicopolis and...