Marguerite de Valois, painted by Clouet in 1560. Photo: Musée Condé, Chantilly. Marguerite was the daughter of King Henry II of France and Catherine de' Medici, and the sister of Kings Francis II, Charles IX and Henry III and of Queen Elizabeth of Spain. She became Queen of France and of Navarre during the late sixteenth century.
Owain ap Maredudd ap Tudur married into the English royal family, creating a distinctly Welsh royal dynasty. Owain ap Marededd ap Tudur, married secretly to Catherine of Valois (widow of Henry V) lived with her away from court until her death in 1437. http://www.everything2.com/index.pl?node=Tudor
Catherine de Valois. The mother of the Tudor dynasty. Wife of Henry V and Owen Tudor. With her second husband Owen Tudor she bore a son Edmund who married Margaret Beaufort who would then produce a new king for England King Henry VII. The first of the Tudors