| Name | John IV DUKE OF BRITTANY | |
| Gender | Male | |
| Person ID | I2594 | Ancestrees |
| Last Modified | 25 Jul 2022 | |
| Family | Mary D. OF EDWARD III, Duchess of Brittany, b. 10 Oct 1344, d. 1362 (Age 17 years) | |
| Last Modified | 8 Jul 2022 | |
| Family ID | F6292 | Group Sheet | Family Chart |
