Guion II Beaumont de Chaumont-en-Vexin, Viscount of Chaumont-en-Vexin, was born 1069 in Chaumont-en-Vexin to Eudes de Beaumont-sur-Oise (1045-1096) and Fille de Chaumont and died 1096 of unspecified causes. He married Humberge du Puiset (1065-) .
Children
| Name | Birth | Death | Joined with |
| Dreux de Chaumont (c1085-c1122) | 1085 Chaumont-en-Vexin | 1122 | Fille de Trie |
| Hugues de Chaumont | |||
Footnotes (including sources)
| ‡ General |