Margalaunt, Morgalant, Murgalant

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An evil Saxon or Saracen king.

With a number of other kings, he invaded Britain shortly after Arthur assumed the throne.

His forces countered with Gawain and his young companions at the battle of Diana Bridge, and Gawain killed him there.

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Sources
Vulgate Merlin | 1220-1235
Arthour and Merlin | Late 13th century