Gunther

275px|thumb|According to the Nibelungenlied (1859) by [[Peter von Cornelius, Gunther orders Hagen to drop the hoard into the Rhine.]]

Gundaharius or Gundahar (died 437), better known by his legendary names Gunther () or Gunnar (), was a historical King of the Burgundians in the early 5th century. Gundahar is attested as ruling his people shortly after they crossed the Rhine into Roman Gaul. He was involved in the campaigns of the failed Roman usurper Jovinus before the latter's defeat, after which he was settled on the left bank of the Rhine as a Roman ally. In 436, Gundahar launched an attack from his kingdom on the Roman province of Belgica Prima. He was defeated by the Roman general Flavius Aetius, who destroyed Gundahar's kingdom with the help of Hunnish mercenaries the following year, resulting in Gundahar's death.