Family
 Adelisa de Beaumont 1)Married/ Related to:  Hugh de Grandmesnil 2)Died 22 Feb 1098 Probably earlier, with the year being a copyist error 3) Notes: It is assumed that Petronilla is a "de Grandmesnil" and therefore that her descent from Hugh is through the male line. While a reasonable assumption, given her claim to the Barony, this is an assumption. Hugh de Grandmesnil is one of the 15 Proven Companions of William the Conqueror known to have fought at the Battle of Hastings in 1066. Subsequently, he became a great landowner in England. Child: 1. Uncertain 2)Notes: The charter identifying Petronilla de Grandmesnil's father as William, identifies her great-grandfather as Hugh de Grandmesnil. It does not, however, name William's father. Given we know WIlliam's grandfather is Hugh, based on family members identified in Orderic Vitalus, there are two possible options for WIlliam's father - Robert (and his wife Emma), or William (and his wife Mabilia). The latter individual, however, seems to have died too early to actually be the mother of Petronilla (based on her dates and Orderic Vitalus). Which makes Robert and Emma the likelier options. That has not been shown here, however, as there is a third option - a William not directly named in Orderic Vitalus. | |||
Sources
1) Source: The Ecclesiastical History of England and Normandy: Volume III "Adeliza, wife of Hugh de Grantmesnil, had died at Rouen seven years before, on the fifth of the ides [11th] of July… This lady was daughter of Ivo, Count de Beaumont, by Judith, her mother. She bore her husband six sons and as many daughters, whose fates were subject to the fleeting changes of human affairs." (Data from secondary evidence)2) Source: Cartulaire de l'abbaye de Saint-Evroul (dioc. de Lisieux). Latin 11055 Petronilla's charter, for her and her family's souls names her father as William (no surname provided) and her great grandfather as Hugh de Granmesnil: ""Ptronilla Comitissa Legrecestrie ... pro salute anime mee necnon et Willelmi patris mei".. External Link
https://gallica.bnf.fr/ark:/12148/btv1b9066843b/f36.item.zoom. Reference: 33v (Data from secondary evidence)
3) Source: The Ecclesiastical History of England and Normandy: Volume III "In the year of our Lord, 1098, the first indiction, Hugh de Grantmesnil, the illustrious lord, took to his bed in England... and he died six days afterwards, that is, on the calends of March [the 22nd February]" (Data from secondary evidence)