Which woman was the sister of XXX?
Marie d'Alençon
Marie d'Alençon (29 March 1373 -- 1417) was a French noblewoman, a Princess of the Blood, and the wife of John VII of Harcourt, Count of Harcourt and of Aumale, Viscount of Châtellerault, Baron of Elbeuf, of Mézières, of Lillebone, of La Saussaye.