Toustien le Coz, Viscount of Avranches, was born circa 995 to Ansfred II le Coz (963-1035) and died circa 1041 of unspecified causes. He married Judith de Montanolier (994-?) 1015 JL .
Children
| Name | Birth | Death | Joined with |
| Robert Bigod (1015-1071) | 1015 | 1071 | |
| Richard le Coz (1024-1082) | 1024 | 1082 | Emma de Conteville (1029-?) |
Footnotes (including sources)
| ‡ General |