During the last quarter of the sixth and the first of the seventh century the various branches of the Bulgar nation, stretching from the Volga to the Danube, were consolidated and kept in control by their prince Kubrat, who eventually fought on behalf of the Greeks against the Avars, and was actually baptized in Constantinople. The power of the Bulgars grew as that of the Avars declined, but at the death of Kubrat, in 638, his realm was divided amongst his sons. One of these established himself in Pannonia, where he joined forces with what was left of the Avars, and there the Bulgars maintained themselves till they were obliterated by the irruption of the Magyars in 893. Another son, Asparukh, or Isperikh, settled in Bessarabia, between the rivers Prut and Dniester, in 640, and some years later passed southwards. After desultory warfare with Constantinople, from 660 onwards, his successor finally overcame the Greeks, who were at that time at war with the Arabs, captured Varna, and definitely established himself between the Danube and the Balkan range in the year 679. From that year the Danube ceased to be the frontier of the eastern empire. The numbers of the Bulgars who settled south of the Danube are not known, but what happened to them is notorious. The well-known process, by which the Franks in Gaul were absorbed by the far more numerous indigenous population which they had conquered, was repeated, and the Bulgars became fused with the Slavs. So complete was the fusion, and so preponderating the influence of the subject nationality, that beyond a few personal names no traces of the language of the Bulgars have survived. Modern Bulgarian, except for the Turkish words introduced into it later during the Ottoman rule, is purely Slavonic. Not so the Bulgarian nationality; as is so often the case with mongrel products, this race, compared with the Serbs, who are purely Slav, has shown considerably greater virility, cohesion, and driving-power, though it must be conceded that its problems have been infinitely simpler. 5 _The Early Years of Bulgaria and the Introduction of Christianity_, 700–893 From the time of their establishment in the country to which they have given their name the Bulgars became a thorn in the side of the Greeks, and ever since both peoples have looked on one another as natural and hereditary enemies. The Bulgars, like all the barbarians who had preceded them, were fascinated by the honey-pot of Constantinople, and, though they never succeeded in taking it, they never grew tired of making the attempt.