Marie of Luxembourg, Duchess of Penthièvre

Marie of Luxembourg (February 12, 1562 - September 6, 1623), Duchess of Penthièvre from 1569 to 1623, Princess of Martigues, was the daughter of Sebastien de Luxembourg, Duke of Penthièvre and Marie de Beaucaire. She is an important figure in the history of the Duchy of Brittany; a distant descendant of Joan of Penthièvre, Duchess of Brittany and her husband Charles of Blois, Duke of Brittany, she aspired to restore the sovereignty of the duchy, and to ascend to the throne with her husband Philippe Emmanuel, Duke of Mercœur, brother-in-law of King Henry III and Governor of Brittany. The victory of Henry IV prevented her from carrying out her project.