When Edward died, Warwick was instrumental in getting the nobles to agree, briefly, to accept Jane as Queen, but Mary I of England managed to rouse enough support to defeat Warwick's plans.
John Dudley, 1st Duke of Northumberland
By Jone Johnson Lewis, About.com Guide
Also known as Warwick, he was the Lord Protector when Edward VI was a minor, and he arranged for the marriage of Lady Jane Grey to his son, Guildford Dudley, just before the death of Edward VI.
John Dudley, 1st Duke of Northumberland (1501 - 1553)
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