Two entries with the name Knight of Maidens.

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Knight of Maidens

Chevalier as Damoisels

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A nickname for Gawain, alluding originally to his reputation as a playboy. However, in the Post-Vulgate Suite du Merlin, Gawain adopts the name after he accidentally kills the maiden lover of Blamoure and swears to help all damsels in distress from then on.

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Sources
Meraugis de Portlesquez | Raoul de Houdenc, early 13th century
Post-Vulgate Suite du Merlin | 1230-1240

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Knight of Maidens

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When Guiron the Courteous first arrived at King Uther Pendragon’s court, he was accompanied by over a dozen young maidens, thus earning himself this nickname.

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Source
Palamedes | c. 1240

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