984 - 1037 (53 years)
| Odo DE PORHOET, Viscount of Britanny I | |
| B: | 1049 |
| D: | 1092 |
| Ann DE LEON | |
| B: | 1065 |
| Josselin DE PORHOET | |
| B: | 1025 |
| D: | 1074 |
| Guithenoc DE PORHOET, Viscount | |
| B: | 990 |
| Guillers, Brittany, (now France) | |
| D: | 1040 |
| Alluram | |
| B: | 994 |
|
| Judicael BRETAGNE | |
| B: | 984 |
| D: | 1037 |
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