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Joan Holland did not have a child with the 5th Baron Willoughby of Eresby. All of the sources and external links lead to pages that are either self-published or have no sources.
These sources state that Margery Willoughby is the daughter of Lucy le Strange (descendant of John I), daughter of the 5th Baron Strange of Knockin and Aline FitzAlan, and the 5th Baron:

• Sir Bernard Burke. A genealogical history of the dormant, abeyant, forfeited, and extinct peerages of the British empire. Harrison, 1866. pg 586, 1049.
• Douglas Richardson, Kimball G. Everingham. Plantagenet ancestry: a study in colonial and medieval families. Genealogical Publishing Com, 2004. pg 325.

-- Lady Meg (talk) 07:35, 28 February 2011 (UTC)[reply]

If her first husband, Lord Edmund of Langley, was the 1st Duke of Cambridge, wasn't she also the Duchess of Cambridge? -- 20:21, 29 October 2013