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 Macedonia and Thrace and weight of the five now abolished prefectures, Drama, Evros, Kavala, Rhodope and Xanthi. In this special case, the region of Eastern Macedonia and Thrace also succeeds the intermediate structure of the two super-prefectures of Drama-Kavala-Xanthi and of Rhodope-Evros into which the five prefectures had been grouped since 1994. Capital of the region is Komotini, which by population is the fourth largest city, following Alexandroupoli, Kavala and Xanthi. The region is divided into the Macedonian regional units of Drama, Kavala and Thasos and the Thracian regional units of Xanthi, Rhodope and Evros, which coincide with the territory of the former