The final decay of Rome

For the first time the Germans are called by Poseidonius (about 90 BC) and Caesar brought them later into the Roman literature. In the first centuries after Christ the Germans had split in North Germans (Skandinavie and Denmark), in East Germans (the region between Oder and Vistula) and the West Germans (between Rhine, Elbe and North Sea). They separated in single tribes which later found together again in bigger alliances of warriors on front on the Roman border wall. In this way developed for example the Alemans and the Franks by the Lower and the Upper Rhine. For the tribes of the East Germans the Gothes advanced widest to the South East, to the Black Sea where they met Huns.
  The Westgothes (Wisigothes) which later opened for the Christianity (their bishop Ulfilas translated about 350 the Old Testament into the Gothic) conquered under their army king Alarich Italy and Rome (410). Under their successor Athaulf they moved to France whrere they established an empire in the capital Tolosa (Touluse). King Eurich expanded the regent to Spain.
  In the North and in the West the break-down of the Roman defence of the empire was in full swing. Even in 166 began the thrust forward of the Marcomans through the Danube borders, accompanied from the Langobard and Quads. Since the middle of the 3rd century invaded the Franks in Gaul. Single German groups invaded in North Italy, too. 406 broke Swebs, Alans and Vandals over the line of the Rhine and continued to Gaul and Spain. 429 went the Vandals under Geiserich over the straits fo Africa. 439 they conquested Cartago, made it to the capital and were threating now Rome from the southern flank like once the Cartagians.
  In the year 413 the Burgundian had established an empire with the captial Worms that was destroyed in 436 by the West Roman governor from Middle Gaul, Aetius, with the help of the Huns. In this time arrived the state of the Huns under their king Attila (the Eztel from the Nibelung tale what describes the fall of the Burgundians) his tallest expansion with the Hungarian low plan as middle point Attilas try 451 to win also the regent over Gaul with the battle on the Catalaunic fields (near Troyes in France) was prevened by an alliance of the West Gothes, the Burgundian and some tribes of Frankonian tribes, led by Aeatius.
  After Attilas death in 453 his empire dissolved without having left important historical traces. The East Gothes got free again and they built under Theodoric the Great (493 - 526), conqueror of Odoaker, an empire in Italy. They had still the idea that the king would exercise the power as the governor of the Roman emperor. So stayed the Roman rights and administration in force. For this tribe what got conveyed a third of the Italian ground stayed Theodoric the army king in the German meaning. He wanted to prevent a fusion with the Italian population with a prohibitation of marriage and with the maintenance of the religious contrasts between the East Gothic Aryans and the Italian Catholicism. To be backed up by the German North aspired Theodoric an alliance of the Germans under his leadership but it failed on the politic of Chlodwig, the king of the Franks who changed to the Catholicism because he needed the influence of the Gaulish church for the securing of his power over his once Roman subjects.
  So that sealed the fall of the German empire on the Mediteranean Sea. The East Romans under Justinian (527 - 565) smashed first the empire of the Vandals in North Africa (the campaign of Belisar) and than the one of the East Gothes in Italy what became in the year 555 to an East Roman province under the governor Narses. The backgrounds were above all the religious contrasts. Only in North Italy were the Langobards successful to build an empire. The price of all in Italy lasting tribes which detached from their original tribes was that they mixed linguistic and racial with the natives of the former universal empire. All states had their difficulties with their foundations which grew from the contrasts between the German thinking of association and the state apparatus of the Roman heritage. So the Germans didn´t become to the heires of the Roman empire but it developed a new German-Roman population instead of the western empire, the world of occidental states.

The Christianity and the empire

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Used literature:
Dr. phil. Bleicken, Jochen et altera, 1963: Propyläen-Weltgeschichte - Rom. Die römische Welt. Propyläen Verlag, Berlin, Frankfurt, Wien.

Liberati, Anna Maria und Bourbon, Fabio 1996: Rom. Weltreich der Antike. Nebel Verlag, Erlangen. English original title: Ancient Rome.

Mommsen, Theodor 1953: Römische Geschichte. Buchclub EX LIBIRS, Zürich.