Conan I of Rennes

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

Conan was the son of Judicael Berengar, succeeding his father as Count of Rennes in 970. [1]

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. [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 illegitimate brothers Hoël and Guerech, and the latter's son Alan. [3]

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. [4]

Mont Saint-Michel, endowed by Conan I, and his final resting place Mont-Saint-Michel depuis la mer.jpg
Mont Saint-Michel, endowed by Conan I, and his final resting place

The Mont St Michel land charter

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]

Marriage alliance

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 Odo of Blois [3] had helped him defeat Judicael Berengar.

Norman Pact

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." [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


  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.

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  1. 1 2 3 4 5 6 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. 1 2 Delumeau, p. 141.
  4. 1 2 3 4 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.


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