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.
Citation:
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 22 May 2013.]