In 1483 Margaret was certainly involved in—if not the mastermind behind—Buckingham's rebellion. Indeed, in his biography of Richard III, historian Paul Murray Kendall describes Beaufort as the "Athena of the rebellion". Perhaps with duplicitous motives (as he may have been desirous of the crown for himself), Buckingham conspired with Beaufort and Woodville to dethrone Richard. Margaret’s son was to sail from Brittany to join forces with him, but he arrived too late.