Many attempts have been made to get at the historical kernel of the tale. Some would see in it traces of the songs which, according to Tacitus, were sung, of old, in honor of Armin (usually, though mistakenly, called Hermann), the deliverer of Germany from the Roman yoke. It has been assumed that the contents of these songs were combined with traditions of the deeds of Civilis, the leader of the Batavian Germans against Roman dominion, as well as of the conquest of Britain by Hengest. Recently, the Norse scholar, Gudbrand Vigfusson, has once more started this "Armin" interpretation of the tale, under the impression that he was the first to do so; whereas, in Germany, Mone and Giesebrecht had worked out that idea already some sixty years ago. In order to support his theory, Vigfusson boldly proposed to change the Hunic name of Sigurd, in the Eddic text, into "Cheruskian." He imagined the former name to be absurd, because Siegfried was not a Hunn; but Vigfusson was unacquainted with the wide historical distribution of the Hunic name in Germany and England. Others saw in the Siegfried story an echo of the overthrow of the Burgundian king Gundahari (Gunther), by Attila, on the Rhine. Gundahari, who first threw himself with an army of 20,000 men against the Hunnic leader, gloriously fell with all his men. In the same way, in the "Nibelungen Lied," the Burgundian king, Gunther, is killed, with all his men, in the land of Etzel, the ruler of the Hiunes. Again, others have pointed to the feats of Theodorick, the king of the Eastern Goths; or to the fate of Siegbert, the king of the Austrasian Franks, who was murdered at the instigation of Fredegunda; or to the powerful Frankish family of the Pipins, from whom Karl the Great hailed, by way of trying to explain some parts of the Siegfried story. With the Pipins of "Nivella," we come upon a word in consonance with "Nibelung."