first bulgarian empire - Background
During the time of the late Roman Empire, the lands of present-day Bulgaria had been organised in several provinces - Scythia Minor, Moesia (Upper and Lower), Thrace, Macedonia (First and Second), Dacia (south of the Danube), Dardania, Rhodope and Hemimont, and had a mixed population of Romanised Getae and Hellenised Thracians. Several consecutive waves of Slavic migration throughout the 6th and the early 7th century led to the almost complete slavicisation of the region.

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