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Conan had to face several revolts from his own nobles. To sustain the unrest, the duke appealed to the help of king Henry II of England, who, in return, demanded the engagement of Conan’s only daughter and heiress Constance with his son Geoffrey Plantagenet.
See also: Dukes of Brittany family tree
| Preceded by: Hoel III and Eudes | Duke of Brittany | Succeeded by: Geoffrey II |