Gundaharius

Gunther (Gundahar, Gundahari, Latin Gundaharius, Gundicharius, or Guntharius, Old English Gūðhere, Old Norse Gunnarr, anglicised as Gunnar, d. 437) was a semi-legendary King of Burgundy in the early 5th century. Legendary tales about him appear in Latin, medieval Middle High German, Old Norse, and Old English texts, especially concerning his relations with Siegfried (Sigurd in Old Norse) and his death by treachery in the hall of Attila the Hun.

In 406 the Alans, Vandals, the Suevi, and possibly the Burgundians crossed the Rhine and invaded Gaul. In 411 AD, the Burgundian king Gundahar or Gundicar set up a puppet emperor, Jovinus, in cooperation with Goar, king of the Alans. With the authority of the Gallic emperor that he controlled, Gundahar settled on the left or western (i.e., Roman) bank of the Rhine, between the river Lauter and the Nahe, seizing Worms, Speyer, and Strasbourg. Apparently as part of a truce, the Emperor Honorius later officially "granted" them the land. Olympiodorus of Thebes also mentions a Guntiarios who was called "commander of the Burgundians" in the context of the 411 usurping of Germania Secunda by Jovinus. (Prosper, a. 386)

...
Wikipedia