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?
Richard III of England Richard III (2 October 1452 – 22 August 1485) was King of England from 1483 until his death in 1485, at the age of 32, in the Battle of Bosworth Field. He was the last king of the House of York and the last of the Plantagenet dynasty. His defeat at Bosworth Field, the last decisive battle of the Wars of the Roses, marked the end of the Middle Ages in England. He is the subject of the historical play "Richard III" by William Shakespeare.
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.