In the classic novel Three Hearts and Three Lions by Poul Anderson, the hero Holger Carlsen gives his hastily-constructed alias as 'Sir Rupert of Graustark.
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Modern fantasy literature has used the Matter of France far less than the Matter of Britain, although L. Sprague de Camp and Fletcher Pratt set one of their Harold Shea stories (The Castle of Iron) in the world of the Matter of France, and Poul Anderson's Three Hearts and Three Lions references the Matter of France.