Aldhelm de Mortaigne, Earl of Cornwall - Did this person exist?

Convoluted ancestry quote:

https://www.wikitree.com/wiki/Burgh-66

Sir William (Fitz-Adelm) de Burgho was not ancestor of the Earls of Kent, of the name of de Burgo, but he was first cousin of Hubert de Burgo, Earl of Kent, and great nephew of Odo de Burgh, Bishop of Baieux, created Earl of Kent by King William the Conqueror, to whom he was half-brother. The Bishop’s brother, Robert de Burgh, was also created Earl of Cornwall, in 1068, he was grandfather of Sir William Fitz Adelm de Burgh (or Burke Whose mother, Agnes, was daughter of Lewis VII, King of France, and who was appointed Governor of Ireland in 1177 – his grandson was created Earl of Ulster, which title was carried into the royal house of Plantagenet by the marriage of Elizabeth de Burgh, only child of William third Earl of Ulster, with Lionel Duke of Clarence. The De Burghs, Earls of Clanricarde, are now the chief branch of this antient house: they derive from William de Burgh, younger brother of the first Earl of Ulster: they formerly enjoyed the English honour of Earl of St. Albans, and have been twice advanced to the Marquisate of Clanricarde, but the honour has each time failed for want of male heirs of the Grantee, while the Earldom has devolved on collateral issue as deswcendants of the Grantee to the Earldom. [1]

Sources

↑ “B. O.”, Letter to the Editor, Gentleman’s Magazine and Historical Review, Volume 84, Part 1, p. 645. https://books.google.com/books?id=sa83AAAAYAAJ&pg=PA645&lpg...

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According to http://www.1066.co.nz/Mosaic%20DVD/whoswho/text/William_Count_of_Mo..., https://en.wikipedia.org/wiki/William,_Count_of_Mortain died without issue.

Disconnecting Aldhelm de Mortaigne, {Fictional} as child of William, Count of Mortain & Isabel FitzRichard, {Fictional}

Isabel’s existence seems problematic also.

This seems in error:

http://freepages.rootsweb.com/~mcneillyandco/genealogy/wmofmortain.htm

William married Isabel FitzRichard de Clare, daughter of Richard FitzRichard de Clare and they had the following children:

*Adelm de Mortain de Burgh - Other names for Adelm were Aldelme, Adelm, de Bourg, de Burgate de Burgh and de Burke. He was sent by Henry II., with Hugh de Lacie, into Ireland, to receive the submission of Roderick O'Connor, King of Connaught. Adelm married Agnes of France, daughter of Louis VII and Eleanor of Aquitaine and they had a son-
**William FitzAldem de Burgh

This needs to be checked out. The child listed of “Mabel FitzWilliam” is misplaced for sure.

https://our-royal-titled-noble-and-commoner-ancestors.com/p166.htm#...

William de Burgo de Moreton, 2nd Earl Cornwall married Isabel FitzRichard, daughter of William FitzRichard. William de Burgo de Moreton, 2nd Earl Cornwall was born circa 1080. He died after 1140.
Family
Isabel FitzRichard (daughter of William FitzRichard)
Children
Walter de Burgh+
Mabel FitzWilliam+1,2
Citations
[S4] Douglas Richardson, Royal Ancestry, Vol. I, p. 8-18.
[S4] Douglas Richardson, Royal Ancestry, Vol. V, p. 275.

No wonder I’m having trouble.

From Stephen Burke

https://www.geni.com/discussions/223151?msg=1436673

Some 17th, 18 and 19th Century genealogists created a completely fictitious family tree for William and Hubert de Burgh, linking in William Fitz Aldelm, Robert of Mortain, Charlemagne et al. The whole theory was demolished by JH Round in "Feudal England" (1909), and there is a further discussion in Clarence Ellis's "Hubert de Burgh A Study in Constancy" (1952). All academic papers on the de Burgh family of Norfolk accept that the family was so minor that we can't even be confident as to who the father of William and Hubert de Burgh was.

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Tagging William fitz Aldelm, Chief Justice of Ireland

Who is currently showing a family of

Family:
Son of Adelmus Burgh and Agnes ?
Husband of Juliana Daisnel
Father of Agnes and Walter de Burgh
Half brother of Reyner de Burgh

Mother Agnes Capet, {Fictional} has been fictiively seen as a Capet - daughter of Eleanor of Aquitaine and Louis VII of France. She was not.

Aldhelm de Mortaigne, {Fictional} Was not the son of Aldhelm de Mortaigne, {Fictional}, who died without issue.