Main
Guillaume de Grandmesnil, Lord of Grandmesnil, was born circa 1100 to Robert II de Grandmesnil (1075-1136) and Agnès de Briquessart (c1080-c1100) and died circa 1147 of unspecified causes. He married Beatrix de Rye .
Children
| Name | Birth | Death | Joined with |
| Pernelle de Grandmesnil (1135-1212) | 1134 Leicestershire, England, United Kingdom | 1 April 1212 | Robert de Beaumont, 3rd Earl of Leicester (1130-1190) |
Footnotes (including sources)
| ‡ General |
| Ω Birth |
|
| ¶ Death |
|