Anne de Mortimer, Countess of Cambridge was the grandmother of the last of the Plantagenet dynasty whose defeat at Bosworth Field marked the end of what in England?
Anne de Mortimer Anne de Mortimer, Countess of Cambridge (27 December 1390 – c. 22 September 1411), was the mother of Richard Plantagenet, 3rd Duke of York, and the grandmother of King Edward IV and King Richard III.
Joan Beaufort, Countess of Westmorland Joan Beaufort, Countess of Westmorland (  1379 – 13 November 1440), was the fourth of the four children (and only daughter) of John of Gaunt, 1st Duke of Lancaster, and his mistress, later wife, Katherine Swynford. In her widowhood, she was a powerful landowner in the North of England.