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.
Citation:
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.]