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,
Bulgarians in Turkey Orthodox Bulgarians who settled in Ottoman-ruled northwestern Anatolia, possibly in the 18th century, and remained there until 1914. Much more intense was the fate of the Bulgarian population of Eastern Thrace in the Ottoman Province ("vilâyet") of Edirne. According to Lyubomir Miletich's detailed study of the province published in 1918, the Bulgarian population of the province (today mostly in Turkey, with smaller parts in Greece and Bulgaria) in 1912 numbered 298,726, of whom 176,554 Exarchists, 24,970 Patriarchists, 1,700 Eastern Catholics and 95,502 Muslims (Pomaks). In the Çorlu and Constantinople regions, Miletich estimates the Bulgarian population at a further 10,000. After