When the Frankish Empire turned the tide and Christianized these Wendish and Polish lands, civilization was carried eastward until it met the Byzantine influences which brought to Russia and the lands east of the Carpathians the culture and Orthodox Christianity of the Eastern or Greek Empire. The nucleus of Russia was organized in the ninth century by Scandinavian Varangians, the Franks of the East, who founded the first civilized state amid a welter of semi-Mongoloid tribes. How much Nordic blood they found in the territories which afterward became Russia we have no means of knowing, but it must have been considerable because we do know that from the Middle Ages to the present time there has been a progressive increase in brachycephaly or broad-headedness, to judge from the rise in the percentage of round skulls found in the cemeteries of Moscow and elsewhere in Russia. Such was the condition of eastern Europe when a new and terrible series of Mongoloid invasions swept over it, this time directly from the centre of Asia. The effect of these invasions was so profound and lasting that it may be well to consider briefly the condition of eastern Europe after the elimination of the Nordics and its partial occupation by the so-called Slavs. Beginning with Attila and his Huns, in the fourth century, there was a series of purely Mongoloid tribes entering from Asia in wave after wave. Similar waves ultimately passed south of the Black and Caspian Seas, and were called Turks, but these were long held back by the power of the Byzantine Empire, to which history has done scant justice. In the north these invaders, called in the later days Tatars, but all essentially of central Asiatic Mongol stock, occupied Balkan lands after the expansion of the south Slavs in those countries. They are known by various names, but they are all part of the same general movement, although there was a gradual slowing down of the impulse. Prior to Jenghiz Khan the later hordes did not reach quite as far west as the earlier ones. The first wave, Attila's Huns, were followed during the succeeding centuries by the Avars, the Bulgars, the Hunagar Magyars, the Patzinaks and the Cumans. All of these tribes forced their way over the Carpathians and the Danube, and much of their blood, notably in that of the Bulgars and Magyars, is still to be found there. Most of them adopted Slavic dialects and merged in the surrounding population, but the Magyars retain their Asiatic speech to this day. Other Tatar and Mongoloid tribes settled in southern and eastern Russia. Chief among these were the Mongol Chazars, who founded an extensive and powerful empire in southern and southeastern Russia as early as the eighth century. It is interesting to note that they accepted Judaism and became the ancestors of the majority of the Jews of eastern Europe, the round-skulled Ashkenazim.