Duke of Brittany

The Duke of Brittany (French: Duc de Bretagne) governed Brittany, a region with strong traditions of independence, including a language and culture all its own. However, incorporation into the Carolingian empire ensured that the political and social institutions were simular to those prevaling elsewhere in western Francia. Prior to the 10th century, Brittany was severely affected by Viking attacks and ducal authority was weak. Dynastic disputes caused the political fragmentation of the duchy into counties and authority suffered even further from the pressures of resisting claims by both the dukes of Normandy and the counts of Anjou. This process of fragmentation was halted and reversed from the mid-eleventh century, when intermarriage resulted in the ducal title vesting in one individual, Duke Alain IV.

Dukes of Brittany

Houses of Vannes and Rennes

• Nominoe of Vannes (r.841-851; 826-841, as a vassal of France)
• Erispoe of Vannes (r.851-857)
• Saloman (r.857-874)
• Pasquitan of Vannes (r.874-877)
• Gurvand of Rennes (r.874-877)
• Judicael of Rennes (r.877-888)

House of Nantes

• Alan I of Vannes, Wrybeard (reigned from 937 to 952)
• Drogo, son (reigned from 952 to 958)
• Hoel, brother (reigned from 960-981
• Guerech, brother (reigned from 981-988)
• Alan II of Vannes (reigned from 988 to 990)

House of Rennes (Brittany united)

• Conan I of Rennes (r.990-992)
• Geoffrey I of Rennes (r.992-1008)
• Alan III of Rennes (r.1008-1040)
• Conan II of Rennes (r.1040-1066)

House of Cornouaille

• Hoel II of Cornouaille (r.1066-1084), married Hawisa, daughter of Alan III
• Alan IV of Cornouaille (r.1084-1112)
• Conan III of Cornouaille (r.1112-1148)
• Eudes (r.1148-1156), married Bertha, daughter of Conan III
• Conan IV, Duke of Brittany, "The Younger", son of Bertha and Alan of Richmond. (r.1156-1168), deposed, d. 1171

House of Anjou

• Geoffrey Plantagenet (r.1166-1186), married Constance, daughter of Conan IV
• Arthur I Plantagenet (r.1196-1203)
• Alix, daughter of COnstance and Guy of Thouars, (r.1203-1221)

House of Dreux

• Peter I of Dreux (r.1213-1237) in right of his wife Alix and as regent of his son
• John I, the Red (r.1237-1286)
• John II (r.1286-1305)
• Arthur II (r.1305-1316)
• John III, the Good (r.1312-1341)

Breton War of Succession (1341-1364)

• Charles of Blois and Joanna of Dreux (r.1341-1364)
• vs. Dukes John IV and John V

House of Montfort

The cadet branch of the House of Dreux

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• John IV of Montfort (r.1341-1345)
• John V, the Conqueror (r.1364-1399)
• John VI (r.1399-1442)
• Francis I (r.1442-1450)
• Peter II (r.1450-1457)
• Arthur III (r.1457-1458)
• Francis II (r.1458-1488)
• Anne of Brittany (r.1488-1514)
• Claudia of France (r.1514-1524)
• François (III), dauphin of France (r.1524-1532), son of Francis I of France and Claudia of France