The conquest of Gaul, begun by Clovis, was finished by his sons: Theuderich, Chlodomer, Childebert and Clotaire. In three successive campaigns, from 523 to 532, they annihilated the Burgundian kingdom, which had maintained its independence, and had endured for nearly a century. Favoured by the war between Justinian, the East Roman emperor, and Theodoric's Ostrogoths, the Frankish kings divided Provence among them as they had done in the case of Burgundy. Thus the whole of Gaul was subjected to the sons of Clovis, except Septimania in the south-east, where the Visigoths still maintained their power. The Frankish armies then overflowed into the neighbouring countries and began to pillage them. Their disorderly cohorts made an attack upon Italy, which was repulsed by the Lombards, and another on Spain with the same want of success; but beyond the Rhine they embarked upon the conquest of Germany, where Clovis had already reduced to submission the country on the banks of the Maine, later known as Franconia. In 531 the Thuringians in the centre of Germany were brought into subjection by his eldest son, King Theuderich, and about the same time the Bavarians were united to the Franks, though preserving a certain autonomy. The Merovingian monarchy thus attained the utmost limits of its territorial expansion, bounded as it was by the Pyrenees, the Alps and the Rhine; it exercised influence over the whole of Germany, which it threw open to the Christian missionaries, and its conquests formed the first beginnings of German history.
But to these wars of aggrandizement and pillage succeeded those fratricidal struggles which disgraced the whole of the sixth century and arrested the expansion of the Merovingian power. When Clotaire, the last surviving son of Clovis, died in 561, the kingdom was divided between his four sons like some piece of private property, as in 511, and according to the German method. The capitals of these four kings--Charibert, who died in 567, Guntram, Sigebert and Chilperic--were Paris, Orleans, Reims and Soissons--all near one another and north of the Loire, where the Germanic inhabitants predominated; but their respective boundaries were so confused that disputes were inevitable. There was no trace of a political idea in these disputes; the mutual hatred of two women aggravated jealousy to the point of causing terrible civil wars from 561 to 613, and these finally created a national conflict which resulted in the dismemberment of the Frankish empire. Recognized, in fact, already as separate provinces were Austrasia, or the eastern kingdom, Neustria, or north-west Gaul and Burgundy; Aquitaine alone was as yet undifferentiated.