Burgundus was the mythical founder of the Burgundian tribe. He was named as one of the five sons of Armenon, or Irmin, in Nennius' Historia Brittonum http://www.gutenberg.org/catalog/world/readfile?fk_files=223700. Irmin was the son of Mannus (Alanus in the Historia Brittonum), in myth variously a war god or the first man to dwell in Europe.