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
Wars of the Roses revolt aimed at installing the Lancastrian Henry Tudor. It has been argued that his supporting Tudor rather than either Edward V or his younger brother, showed Buckingham was aware that both were already dead. The Lancastrian claim to the throne had descended to Henry Tudor on the death of Henry VI and his son in 1471. Henry's father, Edmund Tudor, 1st Earl of Richmond, had been a half-brother of Henry VI, but Henry's claim to royalty was through his mother, Margaret Beaufort. She was descended from John Beaufort, who was a son of John of Gaunt and thus a grandson