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the legitimacy of his wife or her claim as heiress of Edward IV called into question, prior to the marriage he had repealed the "Titulus Regius" which had previously declared the princes (and Elizabeth) illegitimate.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 made to determine whether the bones were male or female. No further scientific examination has since been conducted on the bones, which remain in Westminster Abbey, and DNA analysis (if DNA could be obtained) has not been attempted. A petition was started on the British Government's "e-petition" website requesting that the bones be DNA tested but closed months before its expected close date. If it had received 100,000 signatories a parliamentary debate would have been triggered. Pollard points out that even if modern DNA and carbon-dating proved the bones belonged to the princes, it would not prove who or what