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I don't think he sacrificed himself for Gwen, although he was keeping the promise he had given her. But I do think that he did sacrifice himself for Arthur and Merlin, as he knew that Arthur was planning to sacrifice himself, and that Merlin was planning to do it instead of him, and Lancelot did not want them to lose their lives. Siggy w 09:27, October 2, 2012 (UTC)