Editors. "The Duke of Northumberland is executed". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14858, accessed 19 May 2013.]
The Duke of Northumberland is executed. Edward VI's first minister in his last years, he had unsuccessfully attempted to secure the royal succession for his daughter-in-law and Edward's first cousin once removed, Lady Jane Grey.