Albanian-speakers of Western Thrace migrated towards today's European Turkey (Eastern Thrace), especially near Istanbul. Many Muslim Albanians achieved high office in Ottoman society and many of them, most notably the Köprülü family, became Grand Viziers of the Empire. The majority of the Albanian emigration came from Northern Kosovo and the Korça region of Albania. Descendants of this immigrants would later play an important role in the National Renaissance of Albania. The number of Albanians that resided in the region is unknown, as statistical data of the Ottoman Empire were based on religious identification (millets). Thus, the Orthodox Albanians were part of the Rûm millet,
Eastern Orthodoxy in Turkey Eastern Orthodoxy in Turkey Eastern Orthodox Christianity is today the religion of only a minority in Turkey. It was once the dominant religion, during the time of the Byzantine Empire, as the region that comprises Turkey today was a central part of the Byzantine heritage. Today, less than one tenth of one percent of the population are Orthodox Christians. The provinces of Istanbul and Hatay, which includes Antakya, are the main centers of Christianity in Turkey, with comparatively dense Christian populations, though they are minorities in these areas. The traditional variant of Orthodox Christianity present in Turkey is the Eastern