Editors. "Sir Thomas Wriothesley and Sir Ralph Sadler become principal secretaries". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14632, accessed 10 March 2014.]
In England, the office of principal secretary, which had previously been held by Thomas Cromwell, is now divided between two men, in a system that, with minor alterations, is to last until 1782. The first holders of these posts are Sir Thomas Wriothesley and Sir Ralph Sadler.