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 governor and former Prefect of Rhodopi, (PASOK), elected in the 2010 regional election. The region is home to Greece's main Muslim minority, made up mainly of Pomaks and Western Thrace Turks, whose presence dates to the Ottoman period. Unlike the Muslims of Greek Macedonia, Epirus, and elsewhere in northern Greece, they were exempted from the Greek-Turkish population exchange following the 1923 Treaty of Lausanne (1923). According to the 1991 census, the Muslim minority numbered around 98,000 people or 29% of the population of Western Thrace, of which about half were Western Thrace Turks and the rest (35%) Pomaks and Muslim