This profile states William de Grandison was born in Hertfordshire, England and was the son of Amadeus de Grandison and Banoile de Grandison. It seems most evidence disputes that claim.
Thiese sites give his parents as Peter de Grandson and Agnes of Neuchatel, and if they give a place of birth, it is Switzerland.
https://fmg.ac/Projects/MedLands/ENGLISHNOBILITYMEDIEVAL3D-K.htm#Ka...
https://www.stirnet.com/genie/data/british/gg/gzmisc03.php
https://www.genealogics.org/getperson.php?personID=I00177588&tr...
https://en.m.wikipedia.org/wiki/William_de_Grandison
https://groups.google.com/g/soc.genealogy.medieval/c/EdH6FbOry3E
https://books.google.com/books?id=usQIAQAAMAAJ&pg=PA125#v=onepa...
In https://groups.google.com/g/soc.genealogy.medieval/c/EdH6FbOry3E Douglas Richardson states
As noted above, the mother of Jacques de Grandison (brother of Otho de
Grandison [and William of this profile]) is identified as "perhaps Agnes de Chiny." That her given name was Agnes is proven by her obit in the Grandison breviary in
England [see Complete Peerage, 6 (1926): 69, footnote b]. She is
likewise named Agnes in the document dated 1263 cited by Kingsford
above. I have no particulars on a Chiny connection.
Lastly, the claim that Otho de Grandison [brother of William of this profile] was the son and heir of
Amédée/Amé, sire de Grandson, who occurs 1278-1300, and his wife,
Benoite de La Tour, can be proven to be erroneous by the documents
cited above. That Otho de Grandison was the son and heir of his
father (and not Amédée) is proven by the fact that Otho was seigneur
of Grandson in 1275, not Amédée. Otho de Grandison was still
seigneur of Grandson in 1328 at the time of his death. Moreover, it
is a proven fact that the mother of Otho and his brother, William (in
England) was named Agnes, not Benoite.
Best always, Douglas Richardson, Salt Lake City, Utah
article by C.L. Kingsford entitled "Sir
Otho de Grandison (1238?-1328)," published in Transactions of the
Royal Historical Society, 3rd Series 3 (1909):125-196.
https://books.google.com/books?id=usQIAQAAMAAJ&pg=PA125#v=onepa...
(My summary)
PG 126-128
The town of Grandson on the bank of the Lake of Neuchatel Switzerland.
Towards the close of the first half of the thirteenth century its lord was Peter de Grandson. . grand-uncle of Edward I and himself Earl of Richmond by grant from King Henry . . . He died about 1258, leaving to his widow, Agnes, dau of Count Ulric of Neuchatel several daughters and six sons. Peter of Savoy took about half of them with him when he went to England in 1258. (Footnote states Peter de Grandson was son of Ebal IV)
For William the youngest of the family, a post was found in the household of Edmund of Lancaster.
pg 173
Otho's youngest brother, William, made his permanent home in England. Before Jan 1287 he had married Sybil, dau and coheiress of John de Tregos.
PG 174 He (William) must have been close on ninety years of age when he died , on June 27, 1335. . . . His wife, had died on Sept 21 the previous year. They were both buried at Dore Abbey. . .
Perhaps parents should be Pierre de Grandson and Agnes de Neuchatel, and William's place of birth should be Switzerland.
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