Although the sons of Chlodovech not unfrequently plotted each other’s deposition or murder, yet they generally turned their arms against external enemies, and even on occasion joined to aid each other. The object which each set before himself was the subjection of the nearest independent state. Theuderich therefore looked towards inner Germany and the kingdom of the Thuringians, on the Saal and upper Weser; Childebert and Chlodomer turned their attention towards their southern neighbours the Burgundians. Both these states were destined to fall before the sons of Chlodovech, but neither of them without a hardly fought struggle. Theuderich was distracted from his first attempts against Thuringia by a great piratical invasion of the Lower Rhineland by predatory bands from Scandinavia, led by the Danish king Hygelac (Chrocholaicus), who is mainly remembered as the brother of that Beowulf whom the earliest Anglo-Saxon epic celebrates (515). [Sidenote: Theuderich conquers Thuringia.] The son of the king of the Ripuarians slew the pirate, and next year the Thuringian war began. It did not terminate till 531, when Theuderich, calling in the aid of his brother Chlothar, utterly destroyed the Thuringian realm, and made it tributary to himself. The Frank celebrated his victory first by an unsuccessful attempt to murder his brother and helper Chlothar, who was fain to fly home in haste, and next by the treacherous murder of Hermanfrid, the vanquished Thuringian king, who had surrendered on promise of life. Theuderich led him in conversation around the walls of the city of Zülpich, and suddenly bade his servants push him over the rampart, so that his neck was broken. Southern Thuringia, the region on the Werra and Unstrut, was for the future a tributary province of the Franks. Northern Thuringia, between Elbe and Werra, was overrun by the Saxons, and never came under Theuderich’s power.