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
House of Tudor of his son, Edward, in 1471, Henry became the person upon whom the Lancastrian cause rested. Concerned for his young nephew's life, Jasper Tudor took Henry to Brittany for safety. Lady Margaret remained in England and remarried, living quietly while advancing the Lancastrian (and her son's) cause. Capitalizing on the growing unpopularity of Richard III (King of England from 1483), she was able to forge an alliance with discontented Yorkists in support of her son. Two years after Richard III was crowned, Henry and Jasper sailed from the mouth of the Seine to the Milford Haven Waterway and defeated Richard