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the legitimacy of his wife or her claim as heiress of Edward IV called into question, prior to the marriage he had repealed the "Titulus Regius" which had previously declared the princes (and Elizabeth) illegitimate.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 current historians, including David Starkey, Michael Hicks, Helen Castor and A. J. Pollard regard Richard himself as the most likely culprit. There was no formal accusation against Richard III on the matter; the Bill of Attainder brought by Henry VII made no definitive mention of the Princes in the Tower, but it did accuse Richard of "the unnatural, mischievous and great perjuries, treasons, homicides and murders, in shedding of infant's blood, with many other wrongs, odious offences and abominations against God and man". The "shedding of infant's blood" may be an accusation of the Princes' murder. Hicks speculated that it