The documents in this section are intended to illustrate the history of the Germans from the period before the migrations to the beginning of the struggle between the empire and the papacy, 1073. The historical development of this period resulted in the formation of the Holy Roman Empire, as the form of government for western Europe. The civilization of the Middle Age was in the main the result of the union of Roman and German elements. This union was brought about by the invasion of the Roman empire by the tribes of German blood that lay along and back of the frontier of the empire. It is important, therefore, to understand the character of the German race and institutions, which are illustrated by nos. 1 to 4. The leaders and organizers of the Germans after the settlement were the Franks, who under the Merovingian and Carolingian lines of rulers united the German tribes and bound them together in one great state. This movement is shown in nos. 5 to 14. In this development the life of Karl the Great (nos. 7 to 14) is of especial importance, because of the permanent result of much of his work, particularly his organization of the government (nos. 7 to 9), and his founding of the empire by the union of Italy and Germany (nos. 8, 13, and 14). The dissolution of his vast empire, resulting in the formation of France as a separate state, and in the appearance of the feudal states, is shown in nos. 15 to 22. In the rest of the documents the history of Germany and Italy, the real members of the empire, is followed. Of this the important features are: the continued connection of Germany with Italy (nos. 23 and 29), resulting in the restoration of the empire by Otto I; the feudal organization of Germany (nos. 24, 25, and 27); and the increase of the German territory toward the east (nos. 26, 28, 32). This brings the history down to the accession of Henry IV, with whom begins the long conflict between the empire and papacy which is treated in section III. 1. Selections from the Germania of Tacitus, _ca._ 100 A.D.