Catharine of Valois, daughter of Charles VI. of France, and wife of Henry V. of England, who, on his marriage to her, was declared heir to the throne of France, with the result that their son was afterwards, while but an infant, crowned king of both countries; becoming a widow, she married Owen Tudor, a Welsh gentleman, whereby a grandson of his succeeded to the English throne as Henry VII., and the first of the Tudors (1401‒1438).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Catharine of Sienna * Catharine Parr