Conan I of Rennes

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Conan I of Rennes
Spouse(s) Ermengarde-Gerberga of Anjou
Noble family House of Rennes
Father Judicael Berengar
Died 27 June 992(992-06-27)

Conan I († June 27, 992) nicknamed Le Tort was the Duke of Brittany from 990 to his death. He was the son of Judicael Berengar and Gerberga, and succeeded his father as Count of Rennes in 970.[1]


He assumed the title of Duke of Brittany in the spring of 990 following his attack on Nantes and the subsequent death of Count Alan.[2] 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 brothers Hoël and Guerech .[3] The fractured rule over Brittany resulted in a short vacancy in the title Duke of Brittany; Conan I had to ally himself with the Count of Blois in order to defeat Judicael Berengar before he could assume the title of Duke.[4]

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

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. [5]

Conan married Ermengarde-Gerberga of Anjou,[lower-alpha 1][6] in 973, daughter of Geoffrey I, Count of Anjou and Adele of Vermandois.[1]

Conan's alliance with the Count of Blois [3] had helped him defeat Judicael Berengar. However the alliance with Blois 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." [4] 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. [4] 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. [4] [lower-alpha 2]

Conan died fighting his brother-in-law Fulk Nerra, Count of Anjou at the Battle of Conquereuil on 27 June 992.[7] Conan is buried at Mont Saint-Michel Abbey. [8]


By his wife Ermengarde-Gerberga he had the following issue:

See also

See also


  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)." See: Bachrach, Fulk Nerra (1993),p. 42 & n. 99; Rodulfus Glaber, The Five Books of the Histories, ed. & trans. John France (Oxford: The Clarendon Press, 1989), pp. 58-61.
  2. Price also refers us to de la Borderie 1898, page 246-248 for a discussion of the relationship between Conan I and Richard I.


  1. 1.0 1.1 1.2 1.3 1.4 1.5 Detlev Schwennicke, Europäische Stammtafeln: Stammtafeln zur Geschichte der Europäischen Staaten, Neue Folge, Band II (Verlag von J. A. Stargardt, Marburg, Germany, 1984), Tafel 75
  2. Bachrach 1993, p. 38.
  3. 3.0 3.1 Delumeau, p. 141.
  4. 4.0 4.1 4.2 4.3 Price, p. 370.
  5. Keats-Rohan 1994, p. 18-19.
  6. Bachrach 1993, p. 42.
  7. Bernard S. Bachrach, Warfare and Military Organization in Pre-Crusade Europe (Ashgate Publishing, Aldershot, UK and Burlington, Vermont, 2002), IX, p. 66
  8. Alexander, p. 8.


  • Alexander, Jonathan James Graham (1970). Norman illumination at Mont St Michel, 966-1100. Oxford, UK: Clarendon Press.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  • 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.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  • 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).<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  • Keats-Rohan, K.S.B. (1994). 'Two Studies in North French Prosopography', Journal of Medieval History Vol. 20.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  • Price, Neil S. (1989). The Vikings in Brittany. Saga-Book XXII 6.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>

Conan I of Rennes
House of Rennes
Born: 927 Died: 27 June 992
Preceded by
Judicael Berengar
Count of Rennes
Succeeded by
Geoffrey I
Preceded by
followed by brief
Duke of Brittany