Manaduke, Menaduke
A Knight of the Round Table related to Lancelot. Malory says that he joined Lancelot’s defection from Arthur’s court and participated in the battles against Arthur at Joyous Guard and Benoic (Benwick). In return for his support, Lancelot made him earl of Rouerge.
The Alliterative Morte Arthure says that he was slain during the war against Mordred.
Sources
Alliterative Morte Arthure | c. 1400
Le Morte Darthur | Sir Thomas Malory, 1469-1470