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
Edmund Tudor, 1st Earl of Richmond eldest of John of Gaunt's bastard sons, John Beaufort. She had been previously married to John de la Pole, whose father, William de la Pole, 1st Duke of Suffolk had intended to seek the claim to the throne of her and any children should Henry fail to produce any heirs. William was murdered in 1450, and the marriage between Margaret and John was annulled in the first months of 1453 to enable her to be remarried to Edmund. It was this marriage on 1 November 1455 at Bletsoe Castle which enabled any offspring to lay claim to the English throne