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,
Minorities in Turkey of Greek and Greek-speaking Eastern Orthodox Christians who mostly live in Istanbul, including its district Princes' Islands, as well as on the two islands of the western entrance to the Dardanelles: Imbros and Tenedos ( and "Bozcaada"). Some Greek-speaking Byzantine Christians have been assimilated over the course of the last one thousand years. They are the remnants of the estimated 200,000 Greeks who were permitted under the provisions of the Treaty of Lausanne to remain in Turkey following the 1923 population exchange, which involved the forcible resettlement of approximately 1.5 million Greeks from Anatolia and East Thrace and of half