Editors. "Edward, Earl of Warwick, is executed for treason". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14017, accessed 07 March 2014.]
Edward, Earl of Warwick, is executed for treason. Unlike Perkin Warbeck, he was not an impersonator, but a genuine claimant to the throne, being a Plantagenet and son of George Duke of Clarence. However, the threat recently posed by Perkin Warbeck demonstrated to Henry VII that any potential claimant was a constant risk to his security.