On the north shore of the Black Sea the most easterly possession of the Byzantine Empire was Kherson, a port in the Krim peninsula, and here the territory of the Cæsars came into contact with the Empire or Khanate of the Khazars, a Turko-Finnish race whose dominions stretched in the ninth century from Hungary to the shores of the Kaspian, and north to the source of the Dniepr. They appear to have attained to a comparatively high degree of civilisation, and they kept up commercial and diplomatic relations with Byzantium and the two Kaliphates of Bagdad and Kordova. Their national religion was a form of paganism (subsequently they embraced Judaism), but in spite of differences of faith and race one of their princesses became the wife of the Emperor Constantine V. Their two principal cities were Itil, on the Volga, and Sarkel (the White City), on the Don. Several of the Turanian and Slavonic tribes on their north-west borders acknowledged their authority and paid them tribute, but at the commencement of the ninth century their power was already declining. On their north-east frontier the Khazars had for neighbours the Bulgarians of the Volga, an elder branch of the tribe which had settled in the Balkans. Bolgary, “the great City,” was their capital, and a trading centre much frequented by the merchants and dealers of the various semi-barbaric nations in their vicinity, as well as by the more highly-civilised Khazars and Persians. Northward of all, in the bleak mountain regions of Skandinavia, on the roof of Europe as it were, dwelt the Norsemen, those wild and warlike adventurers who were to leave the impress of their hand on the history of so many countries. In those days, when Iceland and Greenland were as yet undiscovered, Norway, Sweden, and Finland formed a stepping-stone to that unknown Arctic Sea which contemporary imagination peopled with weird and grimly monsters--for the North had its magic lore as well as the shining East. And the fierce vikings, fighting and plundering under their enchanted Raven banner, seemed in those credulous times not far removed from the legendary warlocks and griffons of whom they were presumed to be the neighbours.