Editors. "Duke of Buckingham is executed for treason". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14276, accessed 19 June 2013.]
Edward Stafford, Duke of Buckingham, is executed for constructive treason, accused of having planned to kill the king. He had Plantagenet ancestry, and posed a potential threat as a claimant to the English throne.