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In page Ecumenical Patriarchate of Constantinople:

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The relationship between Constantinople and the Ottoman Empire was frequently bitter, due in no small part to the privilege given to Islam. In the secular Republic of Turkey, tensions are still constant. Turkey requires by law that the Patriarch be a Turkish citizen by birth, which all Patriarchs have been since 1923—all ethnic Greeks from the minuscule and steadily decreasing Greek minority of Turkey, which is causing a shortage of priests and consequently potential candidates for the post of Ecumenical Patriarch.[2] The state's expropriation of church property and the closing of the Orthodox Theological School of Halki are also difficulties faced by the Patriarchate.