The Once and Future King Book 3, Chapter 3
Uncle Dap and Lancelot understand each other, even though no one else does. Uncle Dap is a great expert on knightly matters. When Lancelot is eighteen, Merlyn comes to tell him to join Arthur's Round Table. He tells Lancelot that Arthur and Guenever are married, and that Arthur has already made several people, including Gawaine, knights of his court. Lancelot is terribly disappointed that he was not the first. Merlyn introduces the woman with him, who turns out to be Nimue, and when they leave together, it is clear that Merlyn has finally been bewitched by her. Lancelot and Dap leave the next morning for England.