Editors. "Margaret Countess of Salisbury is executed for conspiracy". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14649, accessed 21 December 2013.]
Margaret Countess of Salisbury, daughter of the Duke of Clarence and thus a potential claimant to the English throne, is executed on a charge of conspiracy for corresponding with her exiled son, Cardinal Reginald Pole.