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Conan I of Rennes

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Conan I of Rennes
Died(992-06-27)27 June 992
Conquereuil, Kingdom of France
Noble familyRennes
Spouse(s)Ermengarde-Gerberga of Anjou
FatherJudicael Berengar

Conan I (died 27 June 992), nicknamed Le Tort (The Crooked), was the Duke of Brittany from 990 to his death.


Count to Duke[edit]

Conan was the son of Judicael Berengar, succeeding his father as Count of Rennes in 970.

Conan assumed the title of Duke of Brittany in the spring of 990 following his attack on Nantes and the subsequent death of Count Alan.[1] As Duke, his rule succeeded the Regency that governed Brittany during the life of Drogo and the fractured rule of Brittany after Drogo's death by his illegitimate brothers Hoël and Guerech, and the latter's son Alan.[2] The fractured rule over Brittany resulted in a short vacancy in the title Duke of Brittany. Conan I had to ally himself with Odo I, Count of Blois in order to defeat Judicael Berengar before he could assume the title of Duke.[3]

Mont Saint-Michel, endowed by Conan I, and his final resting place

The Mont St Michel land charter[edit]

In a charter dated 28 July 990, Conan gave the lands of Villamée, Lillele and Passille to Mont Saint-Michel, all of which later became part of the seigneury of Fougères.[4]

Marriage alliance[edit]

Conan married Ermengarde-Gerberga of Anjou,[a][7] in 973, daughter of Geoffrey I, Count of Anjou and Adele of Vermandois.[8] Conan's alliance with Odo of Blois [2] had helped him defeat Judicael Berengar.

Norman Pact[edit]

The alliance with Blois eventually became troublesome and he later needed to "rid himself of influence from Blois, [which he accomplished by signing] a pact with Richard I of Normandy; [this pact] established firm Breton-Norman links for the first time."[3] Richard I had married the daughter of Hugh I the Great, and after this marriage had re-asserted his father's claim as Overlord of the Breton duchy. [3] Conan I's pact with Normandy strengthened that assertion but the historical documentation for that Overlordship claim remains doubtful because it largely appears only in the less than authoritative writings of Dudo of Saint-Quentin.[3][b]


Conan died fighting his brother-in-law Fulk Nerra, Count of Anjou at the Battle of Conquereuil on 27 June 992.[10] Conan is buried at Mont Saint-Michel Abbey.[11]


Conan and his wife Ermengarde-Gerberga had:

See also[edit]


  1. ^ Raoul Glaber in his Histories [Bk. II, Ch. 3, para. 4] was openly hostile to Conan and stated that after he married Ermengarde-Gerberga, Fulk Nerra's sister, he was "the most insolent of principes (Latin: leader, first among his people)."[5][6]
  2. ^ Price also refers us to de la Borderie 1898, for a discussion of the relationship between Conan I and Richard I.[9]


  1. ^ Bachrach 1993, p. 38.
  2. ^ a b Delumeau 1969, p. 141.
  3. ^ a b c d Price 1989, p. 370.
  4. ^ Keats-Rohan 1994, p. 18-19.
  5. ^ Bachrach 1993, p. 42 & n. 99.
  6. ^ Glaber 1989, p. 58-61.
  7. ^ Bachrach 1993, p. 42.
  8. ^ Bachrach 1993, p. 262.
  9. ^ Price 1989, p. 246-248.
  10. ^ Bachrach 2002, p. 66.
  11. ^ Alexander 1970, p. 8.
  12. ^ a b Bachrach 1993, p. 266.


  • Alexander, Jonathan James Graham (1970). Norman illumination at Mont St Michel, 966–1100. Oxford, UK: Clarendon Press.
  • Bachrach, Bernard S. (1993). Fulk Nerra, the neo-Roman consul, 987-1040: A Political Biography of the Angevin Count. Berkeley and Los Angeles: University of California Press.
  • Bachrach, Bernard S. (2002). Warfare and Military Organization in Pre-Crusade Europe. Ashgate Publishing.
  • Delumeau, Jean (1969). Histoire de la Bretagne. Toulouse, France: Edouard Privat editeur; Jean Delumeau, directeur, with contributing authors P-R Giot, J L'Helgouach, J Briard, J-B Colbert de Beaulieu, L Pape, P Rache, G Devailly, H Touchard, J Meyer, A Mussat, and G Le Guen (chapters do not specify individual authors).
  • Keats-Rohan, K.S.B. (1994). 'Two Studies in North French Prosopography', Journal of Medieval History Vol. 20.
  • Glaber, Rodulfus (1989). France, John (ed.). The Five Books of the Histories. The Clarendon Press.
  • Price, Neil S. (1989). "The Vikings in Brittany" (PDF). Saga-Book of the Viking Society. XXII (6): 319–440.
Conan I of Rennes
House of Rennes
Born: 927 Died: 27 June 992
Preceded by Count of Rennes
Succeeded by
Title last held by
Duke of Brittany