Adtherp
Knight who sheltered Queen Isoud from Palamides in Le Morte d'Arthur.
Adtherp is a knight in Malory's Le Morte d'Arthur who intervenes to protect Queen Isoud during the Tristram cycle. When Isoud was in danger, "there came a knight to her that had a castle thereby, his name was Sir Adtherp" (Le Morte d'Arthur, Book VIII, Ch. XXX). Though wounded, Adtherp directed aid: "Sir, I am so wounded I may not follow, but ride you this way and it shall bring you into my castle, and there within is the queen" (Le Morte d'Arthur, Book VIII, Ch. XXX).
Adtherp appears in three attestations across two consecutive chapters, serving as a supporting figure in the Palamides-Isoud-Tristram conflict. When Tristram arrived, he "found Sir Adtherp sore wounded, and he told him how the queen would have drowned herself had he not been" (Le Morte d'Arthur, Book VIII, Ch. XXXI). Adtherp thus fills the role of honourable bystander -- wounded protecting the queen, providing crucial intelligence to Tristram, and disappearing from the narrative once the principals reconnect.
Appears in: Beings, Entities in Le Morte d'Arthur, British Tradition