Asparukh

…the horde that Kurt’s son Asparukh led westward across the Dniester River and then southward across the Danube. There, on the plain between the Danube and the Balkan Mountains, they established the kernel of the so-called first Bulgarian empire—the state from which the modern nation of Bulgaria derives its name.…

One of these sons, Asparukh (or Isperikh), moved into Bessarabia (between the Dniester and Prut rivers) and then crossed to the south of the Danube, where his people conquered or expelled the Slavic tribes living north of the Balkan Mountains. The Byzantine emperor Constantine IV led an army against…