House of Tudor Richmond on 15 December 1449 and was married to Lady Margaret Beaufort, the great-granddaughter of John of Gaunt, the progenitor of the house of Lancaster; Jasper became the first Earl of Pembroke on 23 November 1452. Edmund died on 3 November 1456. On 28 January 1457, his widow Margaret, who had just attained her fourteenth birthday, gave birth to a son, Henry Tudor, at her brother-in-law's Pembroke Castle. Henry Tudor, the future Henry VII, spent his childhood at Raglan Castle, the home of William Herbert, 1st Earl of Pembroke, a leading Yorkist. Following the murder of Henry VI and death
Earl of Richmond II was the last Duke of Brittany associated with the courtesy title. He waived all rights to holdings in England an assigned them to Henry Tudor, in advance of Henry's armed invasion of England. After Henry's attainment of the English throne, the Earl of Richmond and the Honour of Richmond were merged with the English crown. Edmund Tudor had been educated by Catherine de la Pole, the Abbess of Barking, who brought him to Henry VI's attention. Upon attaining adulthood, Edmund joined Henry VI at court. In 1449 Henry VI knighted him and then circa 1452 summoned Edmund to parliament