Balkan–Danubian culture
The Balkan–Danubian culture was an early medieval archaeological culture which emerged in the region of the Lower Danube in the 8th century and flourished until the 11th century. In Bulgaria it is usually referred to as the Pliska–Preslav culture, while in Romania it is called the Dridu culture. It is better represented in the territory of modern-day Central and Northern Bulgaria, although it probably spread north of the Danube as well due to the continuous extension of the First Bulgarian Empire over the territory of present-day Romania. The Balkan–Danubian culture is described as an early Slavic-Bulgar culture, but besides Slavic and Bulgar elements it also possesses some Romance components. However, this only appears in the southern regions of what is now southern Bulgaria, all of which were heavily influenced by the Byzantine Empire.