To the ethnologist the later history of the Bulgarians is of exceptional interest. They entered the Danubian lands in the seventh century as typical Ugro-Finns, repulsive alike in physical appearance and mental characters. Their dreaded chief, Krum, celebrated his triumphs with sanguinary rites, and his followers yielded in no respects to the Huns themselves in coarseness and brutality. Yet an almost complete moral if not physical transformation had been effected by the middle of the ninth century, when the Bulgars were evangelised by Byzantine missionaries, exchanged their rude Ugrian speech for a Slavonic tongue, the so-called "Church Slav," or even "Old Bulgarian," and became henceforth merged in the surrounding Slav populations. The national name "Bulgar" alone survives, as that of a somewhat peaceful southern "Slav" people, who in our time again acquired the political independence of which they had been deprived by Bajazet I. in 1392. Nor did this name disappear from the Volga lands after the great migration of Bulgar hordes to the Don basin during the third and fourth centuries A.D. On the contrary, here arose another and a greater Bulgar empire, which was known to the Byzantines of the tenth century as "Black Bulgaria," and later to the Arabs and Western peoples as "Great Bulgaria," in contradistinction to the "Little Bulgaria" south of the Danube[730]. It fell to pieces during the later "Tatar" wars, and nothing now remains of the Volga Bulgars, except the Volga itself from which they were named.