Princes in the Tower becoming king, Henry married the princes' eldest sister, Elizabeth of York, to reinforce his claim to the throne. Not wanting the legitimacy of his wife or her claim as heiress of Edward IV called into question, prior to the marriage he had repealed the "Titulus Regius" which had previously declared the princes (and Elizabeth) illegitimate. Markham suggests the princes were executed under Henry's orders between 16 June and 16 July 1486, claiming that it was only after this date that orders went out to circulate the story that Richard had killed the princes, and that the princes' mother, Elizabeth Woodville,
Princes in the Tower John of Gaunt, 1st Duke of Lancaster through John Beaufort, son of John of Gaunt on his mother's side, Buckingham may have hoped to accede to the throne himself in due course; alternatively, he may have been acting on behalf of a third party. Some, notably Paul Murray Kendall, regard Buckingham as the likeliest suspect: his execution, after he had rebelled against Richard in October 1483, might signify that he and the king had fallen out; Weir takes this as a sign that Richard had murdered the princes without Buckingham's knowledge and Buckingham had been shocked by it. A contemporary