Bulgarians (Turkish: Bulgarlar) form a minority of Turkey. People of Bulgarian ancestry include a large number from the Pomak and a very small number of Orthodox of ethnic Bulgarian origin. Prior to the ethnic cleanising at the Destruction of the Thracian Bulgarians in 1913 the Christian Bulgarians had been more than the Pomaks, afterwards Pomak refugees arrived from Greece and Bulgaria. Pomaks are also Muslim and speak a Bulgarian dialect. According to Ethnologue at present 300,000 Pomaks in European Turkey speak Bulgarian as mother tongue. It is very hard to estimate the number of Pomaks along with the Turkified Pomaks who live in Turkey, as they have blended into the Turkish society and have been often linguistically and culturally dissimilated. According to Milliyet and Turkish Daily News reports, the number of the Pomaks is 600,000. The origin of the Pomaks has been debated, but there is an academic consensus that they are descendants of native Bulgarians who converted to Islam during the Ottoman rule of the Balkans; nevertheless, most of them currently do not profess Bulgarian identity.
The medieval Bulgarian Empire had active relations with Eastern Thrace before the Ottoman conquest of the Balkans in the 14th–15th century: the area was often part of the Bulgarian state under its stronger rulers from Krum's reign on, such as Simeon I and Ivan Asen II; the city of Edirne (Adrianople, Odrin) was under Bulgarian control a number of times. Bulgarians were sometimes taken captive during Byzantine raids and resettled in Asia Minor (modern Asian Turkey), but their traces are lost in the Middle Ages. As the Balkans were subjugated by the Ottomans, the entirety of the Bulgarian lands fell under Ottoman domination.