From the start, then, we find the English nationality growing up under very different conditions from those which obtained in other parts of Europe. So far as institutions are concerned, Teutonism was less modified in England than in the German fatherland itself, For the gradual conquest and Christianization of Germany which began with Charles the Great, and went on until in the thirteenth century the frontier had advanced eastward to the Vistula, entailed to a certain extent the romanization of Germany. For a thousand years after Charles the Great, the political head of Germany was also the political head of the Holy Roman Empire, and the civil and criminal code by which the daily life of the modern German citizen is regulated is based upon the jurisprudence of Rome. Nothing, perhaps, could illustrate more forcibly than this sheer contrast the peculiarly Teutonic character of English civilization. Between the eighth and the eleventh centuries, when the formation of English nationality was approaching completion, it received a fresh and powerful infusion of Teutonism in the swarms of heathen Northmen or Danes who occupied the eastern coasts, struggled long for the supremacy, and gradually becoming christianized, for a moment succeeded in seizing the crown. Of the invasion of partially romanized Northmen from Normandy which followed soon after, and which has so profoundly affected English society and English speech, we need notice here but two conspicuous features. First, it increased the power of the crown and the clergy, brought all England more than ever under one law, and strengthened the feeling of nationality. It thus made England a formidable military power, while at the same time it brought her into closer relations with continental Europe than she had held since the fourth century. Secondly, by superposing a new feudal nobility as the upper stratum of society, it transformed the Old-English thanehood into the finest middle-class of rural gentry and yeomanry that has ever existed in any country; a point of especial interest to Americans, since it was in this stratum of society that the two most powerful streams of English migration to America--the Virginia stream and the New England stream--alike had their source. [Sidenote: Primitive Teutonic institutions less modified in England than in Germany]