Editors. "John Dudley is created Duke of Northumberland". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14823, accessed 04 May 2016.]
John Dudley, Earl of Warwick, who in the wake of the fall of Protector Somerset now leads Edward VI's government, takes on the title of Duke of Northumberland.
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