The problem of identifying the term Burjan, used by Arab-Muslim historiography and geographical literature, with the ethnopolitical formations of the Middle Ages known to history, is still a "white spot" of science. The ethnonym and toponym Burjan is considered to be the Arabic name of Danube Bulgaria. However, upon closer examination, this thesis does not stand up to criticism. The analysis of Arabic, Persian, Armenian, Byzantine and Khazar sources shows that the name Burjan meant an independent ethnic group, the news of which, after breaking through the centuries, became associated exclusively with the Bulgars - the North Caucasus and Danube. In fact, the Burjans, repeating the fate of the Bulgars, split into several parts and settled throughout Eurasia-from Danube Bulgaria to Mangyshlak, giving rise to the Bulgar-Burjan problem. Some researchers, considering this problem unsolvable, were inclined to recognize the term as a consequence of lapsus calami, however, this conclusion is crossed out by the very fact of the existence of a living carrier of the mentioned ethnonym in the person of the Burjan tribe as part of the modern Bashkirs. Key words: Berzilia, Burjan, Bulgars, Huns, Suvars. Europeans ' familiarity with Arabic historiography and geographical literature led them to the conclusion that Arab authors refer to Danube Bulgaria as Burjan 1. I. Markwart came to the conclusion that under the burjans of Arab sources are hidden the Bulgarians of the Danube and North Caucasus, but not the Volga, and also - in the description of Harun ibn Yahya 2's journey to Western Europe-the Burgundians [Marquart, 1903, S. 207, 491]. Since then, the point of view on this issue has hardly changed at all. To the question of why the Arabs called the Danube Bulgars Burjans, there is still no satisfactory answer. A. Garkavi, commenting on the information of Arab authors, wrote:"...why these Bulgars were used by Western writers [name] Burgiani, Burgani, and the eastern Burjans are wel ... Читать далее