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 Castle, they took the stronghold and captured Edmund Tudor. As Herbert's troops moved on to Aberystwyth, Edmund was left behind, imprisoned in Carmarthen Castle. On 3 November 1456, Edmund became infected with the bubonic plague and died. He was buried at the nearby Franciscan Church in Carmarthen. There were suspicions that Edmund may have been murdered, and so a trial was held several months later with several parties accused, but no one was found guilty. Edmund's remains were removed to the choir of St David's Cathedral, Pembrokeshire in 1539, due to the dissolution of the monasteries enacted by his grandson