Guillaume I de Milly, Lord of Milly, was born 1120 in Milly-la-Forêt to Thierry de Milly (1080-1135) and died 1180 of unspecified causes. He married Pétronille de Châtenois (c1130-) 1153 JL .
Children
| Name | Birth | Death | Joined with |
| Guillaume II de Milly (c1155-c1202) | 1155 Milly-la-Forêt | 1202 | Marguerite de La Chapelle (-1212) |
Footnotes (including sources)
| ‡ General |