While Odoacer was still reigning in Italy, and Theodoric the Amal had not yet left the Balkans, or the banks of the Danube, the foundations of a great kingdom were being laid upon the Scheldt and the Meuse. Early in the fifth century the confederacy of marsh-tribes on the Yssel and Lech who had taken the common name of Franks, had moved southward into the territory of the Empire, and found themselves new homes in the provinces which the Romans called Belgica and Germania Inferior. For many years the hold of the legions on this land had been growing weaker; and, long ere it became a Frankish kingdom, it had been largely sprinkled with Frankish colonists, whom the emperors had admitted as military settlers on the waste lands within their border. In the lowlands of Toxandria, which after-ages called Brabant and Guelders, there were no large cities to be protected, no great fortresses to be maintained, and, while the Romans still exerted themselves to hold Treveri and Colonia Agrippina and Moguntiacum,[7] they allowed the plains more to the north and west to slip out of their hands. [Sidenote: The Franks in Lower Germany.] By the second quarter of the fifth century the Franks were firmly established on the Scheldt and Meuse and lower Rhine, where the Roman garrisons never reappeared after the usurper Constantine had carried off the northern frontier legions to aid him in his attack on Italy (406). By this time, too, Colonia Agrippina, first of the great Roman cities of the Rhineland, seems to have already fallen into the hands of the Franks. Between 430 and 450 they continued to push forward as far as the Somme and the Moselle, and when, at the time of Attila’s great invasion of Gaul, the last imperial garrisons in the Rhineland were exterminated, and the last governors driven forth by the Huns from Treveri and Moguntiacum and Mettis, it was the Franks who profited. After the Huns had rolled back again to the East, Frankish kings, not Roman officials, took possession of the ravaged land along the Moselle and Rhine, and the surviving provincials had for the future to obey a Teutonic master near home, not a governor despatched from distant Ravenna. Footnote 7: Trier, Köln, and Mainz. The Franks were now divided into two main hordes; the Salians—who took their name from Sala, the old name of the river Yssel—dwelt from the Scheldt-mouth to the Somme, and from the Straits of Dover to the Meuse. The Ripuarians, whose name is drawn from the fact that they inhabited the bank (_ripa_) of the Rhine, lay along both sides of the great river from its junction with the Lippe to its junction with the Lahn, and extended as far east as the Meuse. Each of these two tribes was ruled by many kings, all of whom claimed to descend from the house of the Merovings, a line lost in obscurity, whose original head may, perhaps, have been the chief who in the third century first taught union to the various tribes who formed the Frankish confederacy.