Individual Details
Mauger "The Younger" de Brittany Lord of St. Clair
( - )
Families
| Father | Richard 2nd "the Good" de Brittany Duke of Brittany, Count of Rennse (963 - 1027) |
| Mother | Judith de Britannie Duchess Consort of Burgundy (982 - ) |
| Sibling | Adelais (Judith) de Normandie (1007 - 1037) |
| Sibling | Richard 3rd de Normandie Duke of Normandy (997 - 1028) |
| Sibling | Mauger "the Young" de Corbeil Count of Corbeil & Archbishop of Rouen (1002 - ) |
| Sibling | Pavia de Ham Countess of Vermandois (1000 - 1034) |
| Sibling | Adele de Champagne Countess of Clermont (991 - 1057) |
| Sibling | Eleanore de Brittany Princess and Countess of Normandie and Flanders (1005 - ) |
| Sibling | Robert 1st "The Magnificent/The Devil" de Normandie Duke of Normandy ( - 1035) |
| Sibling | Adelaide (Alice/Adeliza/Aelis) de Roucy de Normandie ( - ) |