Ralph de Mainwaring/Mesnilwarin, Justice of Chester was born circa 1155 in England to Roger de Mainwaring (c1130-) and Ellen Unknown and died after 1210 England of unspecified causes. He married Amicia de Meschines (-c1210) .
Children
| Name | Birth | Death | Joined with |
| Roger de Mainwaring (c1185-) | 1185 | ||
| Bertrade de Mainwaring (-1246) | |||
Siblings
| Name | Birth | Death | Joined with |
| Ralph de Mainwaring (c1155-aft1210) | 1155 England | 1210 England | Amicia de Meschines (-c1210) |