Two entries with the name Margondes.
Margondes
Magoundes, Margoundes
A knight who fought in Arthur’s army against the Saxons at Clarence. He is said to be a leader of the Sesnes, involved in the attack on Vandaliors Castle, early in Arthur’s reign.
He is first called the King of Sorelois, a position later given to Galehaut. Later, he is named as the seneschal of that country.
Source
Vulgate Merlin | 1220-1235
Margondes
Margonces, Margondre, Margondrez, Margounces
A cousin of Augis li Sesne (Hengist).