See also
| Husband: | Peter I de BRETAGNE (c. 1185-1250) | |
| Wife: | Alix of THOUARS ( - ) | |
| Children: | John I de BRETAGNE (c. 1217- ) | |
| Yolande de DREUX (1218-1272) | ||
| Arthur de BRETAGNE ( - ) | ||
| Name: | Peter I de BRETAGNE | |
| Sex: | Male | |
| Father: | Robert II of DREUX (1154-1218) | |
| Mother: | - | |
| Birth | c. 1185 | |
| Death | 26 May 1250 (age 64-65) | |
| Name: | Alix of THOUARS | |
| Sex: | Female | |
| Father: | - | |
| Mother: | - | |
| Name: | John I de BRETAGNE | |
| Sex: | Male | |
| Spouse: | Blanche of NAVARRE ( - ) | |
| Birth | c. 1217 | |
| Name: | Yolande de DREUX | |
| Sex: | Female | |
| Spouse: | Hugh XI de LUSIGNAN (1220-c. 1255) | |
| Birth | 1218 | |
| Death | 1272 (age 53-54) | |
| Name: | Arthur de BRETAGNE | |
| Sex: | Male | |
Second son.