Joan Beaufort, Countess of Westmorland

Joan Beaufort was the youngest of the four legitimised children and only daughter of John of Gaunt, 1st Duke of Lancaster, by his mistress, later wife, Katherine de Roet. Joan married Ralph de Neville, 1st Earl of Westmorland and in her widowhood became a powerful landowner in the north of England, as countess of Westmorland. Joan was grandmother to kings Edward IV and Richard III, and great-great grandmother to Henry VIII.