Two entries with the name Marganor.
Marganor
Maganors, Marganors, Margaroz, Margnamur, Morganor
The seneschal of the King with a Hundred Knights.
With his lord, he joined the kings in rebellion against Arthur, fighting Arthur at the battle of Bedegraine. Later, he invaded the lands of the Lord of the Narrow Borderland and captured the lord’s defenders, Yvain and Sagremor (Sagramore).
Marganor was eventually defeated by Sir Hector (Ector de Maris) before the castle Lestroite Marche.
Sources
Lancelot do Lac | 1215-1220
Vulgate Lancelot | 1215-1230
Vulgate Merlin | 1220-1235
Arthour and Merlin | Late 13th century
Marganor
Marganors
A knight who joined Arthur’s battle against the Saxons at Vambieres.
Source
Le Livre d’Artus | Early 13th century