Two entries with the name Galehaut the Brown.
Galehaut the Brown
A knight of the “Brown” lineage, which won fame in the generation before Arthur and the Knights of the Round Table. He was the son of Hector or Mailhot, the brother of a second Hector, and the father of a third Hector.
He cuckolded a knight named Diocenar and, with Diocenar’s wife, had a son named Febus.
Galehaut enjoyed numerous adventures before a knight named Armond set upon him with fifty warriors. Though unarmed, Galehaut managed to kill Armond and eighteen of his attackers before he fell under their swords.
In Italian romance, Galehaut the Brown is often confused with the first Galehaut (Galeholt of Sorelois).
Sources
Palamedes | c. 1240
Les Prophecies de Merlin | Richart d’Irlande, 1272-1279
Galehaut the Brown
Uncle of the above Galehaut the Brown, brother of Hector the Brown and father of another Hector the Brown.
With his brother, he left Britain to avoid King Vortigern’s wrath but was marooned on an island.
Source
Les Prophecies de Merlin | Richart d’Irlande, 1272-1279