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the legitimacy of his wife or her claim as heiress of Edward IV called into question, prior to the marriage he had repealed the "Titulus Regius" which had previously declared the princes (and Elizabeth) illegitimate.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 vise of the Duke of Buckingham". This led Michael Bennett to suggest that possibly some of Richard's prominent supporters, Buckingham and Tyrell, murdered the princes on their own initiative without waiting for Richard's orders. Bennett noted in support of this theory: 'After the King's departure Buckingham was in effective command in the capital, and it is known that when the two men met a month later there was an unholy row between them.' Buckingham is the only person to be named as responsible in a contemporary chronicle other than Richard himself. However, for two reasons he is unlikely to have