William, Count of Mortain - Evidence for children?

Cross post.

https://www.geni.com/discussions/223153?msg=1436675

Stephen Burke
12/16/2020 at 5:55 PM
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No one of this name appears to have been Earl of Cornwall. No son of William Count of Mortain became Earl of Cornwall. The de Burgh name is not assocated with the Earls of Cornwall, or with the Counts of Mortain in the historical record.

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Erica Howton C
Today at 9:09 AM
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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&amp......

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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, Earl of Cornwall as child of William, Count of Mortain & Isabel FitzRichard de Clare

Isabel’s existence seems problematic also.