726 Regarding the ethnicity of those who lived on the Danube tribes there is no consensus among researchers. V. Zlatarski calls Tatoosh Pechenegs Seslava (Vseslav) and Satsu - Bulgaria; N. Benesku considers all their Vlach (Zlatarski, History ..., II, page 183;. Banescu, Ein ethnographisches Problem ..., Ss 297-299, 306-307 See also Litavrin, Bulgaria and Byzantium, p... . 420). 727 Those living - a fortress in the lower reaches of the Danube. The question of its exact location is still controversial (see. Litavrin, Bulgaria and Byzantium, p. 420, n. 18).