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Geoffroi I

Male - 1008

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  • Name Geoffroi I
    Gender Male
    Death 20 Nov 1008 
    Person ID I7133  Petersen-de Lanskoy
    Last Modified 21 Jun 2026

    Father Conan I "le Tort",   b. Abt 922   d. 27 Jun 992, Second Battle of Conquereuil near Nantes, Loire-Atlantique, France Find all individuals with events at this location (Age 70 years)
    Mother Ermengarde of Anjou
    Marriage Abt 973 
    Family ID F3233  Group Sheet  |  Family Chart

    Family Hawise of Normandy   d. 21 Feb 1034
    Marriage From 996 to 999 
    Children 
     1. Alan of Brittany
     2. Eudon of Brittany   d. 7 Jan 1079
     3. Adele of Brittany
    Family ID F3232  Group Sheet  |  Family Chart
    Last Modified 30 Jun 2026

  • Notes 
    • RESEARCH_NOTES:
      1. “Royal Ancestry: A Study in Colonial & Medieval Families,” Douglas Richardson (2013):
      “GEOFFROI I, Duke of Brittany, son and heir. He married between 996 and 999 HAWISE OF NORMANDY, legitimated daughter of Richard I, Duke of Nomandy, by his 2nd wife, Gonnor. They had two sons, Alan [Duke of Brittany] and Eudon [Count (or Duke) of Brittany], and one daughter, Adele [Abbess of Saint-Georges at Rennes]. GEOFFROI I, Duke of Brittany, died 20 Nov. 1008. His widow, Hawise, died 21 Feb. 1034.
      Recueil des Historiens des Gaules et de la France 10 (1874): 175 (Ex Chronico S. Michaelis: "MVIII [A.D. 1008]. Obiit Gaufredus Dux Britanniæ filius Conani filii Juhelli Berengarii, dum pergeret Romam causa ocationis. Hujus sororem Judith duxit secundus Ricardus Dux Normannorum: et ipse Gaufredus duxit Havidem sororem prædicti Richardi, ex qua genuit duos filios Alanum et Eudonem, qui ei succcessit, partito Ducatu Britannia."), 294 (Ex Chronico Kemperlegiensi: "MVIII [A.D. 1008]. Obiit Gauffridus Dux Britannia, filius Conani filii Juhaelis Berengarii, dum pergeret Romam gratia orationis."), 294 (Ex Chronico Kemperlegiensi: "MXXXIV [A.D. 1034]. Haduisa Comitissa Britannia, vidua Gauffridi, et mater Alani et Eudonis, IX Kal. Martii [21 Feb.] obiit."). Brandenburg Die Nachkommen Karls des Großen (1935) X 9. C.P. 10 (1945): 780 (chart), 779, 781 (sub Richmond). Schwennicke Europäische Stammtafeln 2 (1984): 75. Winter Descs. of Charlemagne (800-1400) (1987): X.6, XI.9-X.I.11.”

      2. “Royal Ancestry: A Study in Colonial & Medieval Families,” Douglas Richardson (2013):
      “CONAN I le Tort, Duke of Brittany, son of Judicael Bérenger, Count of Rennes, by his wife, Gerberge. He was born about 922. He married about 973 ERMENGARDE OF ANJOU, daughter of Geoffroi I Grisegonelle, Count of Anjou, by his 1st wife, Adèle, daughter of Robert, Count of Troyes and Meaux [see Appendix, Line A, Gen. 8 for her ancestry]. They had four sons, Geoffroi (I) [Duke of Brittany], Judicael [Bishop of Vannes], Catuallon [Abbot of Redon], and Urvod, and one daughter, Judith. He was present at the court of Eudes, Count of Chartres, in 979. In 981 he fought a battle against Guerech, Count of Nantes, and his Angevin allies, which is called the "first" Battle of Conquereuil. In 990 he made a donation to Mont Saint-Michel. CONAN I, Duke of Brittany, was slain at the 2nd Battle of Conquereuil near Nantes 27 June 992.
      Anselme Hist. de la Maison Royale de France 6 (1730): 3-21 (sub Anjou). Recueil des Historiens des Gaules et de la France 10 (1874): 175 (Ex Chronico S. Michaelis: "DCCCCXCII [A.D. 992]. Secundum bellum full in Concurrum, in quo Fulco Comes Andegavensis victor extitit; et Conanus Brito occisus est: Kal. Julii [1 July] filius Juhelli Berengarii."), 294 (Ex Chronico Kemperlegiensi: "Anno DCCCCXCII [A.D. 992]. Obiit Conanus Comes filius Judicaelis Berengarii Comitis Rhedonensis in bello Concurruc occisus est v Kal. Julii [27 June]."). Brandenburg Die Nachkommen Karls des Großen (1935), IX 8. Schwennicke Europäische Stammtafeln 2 (1984): 75; 3 (1989): 116 (ancestry of Ermengarde d'Anjou). Winter Descs. of Charlemagne (800-1400) (1987): IX.3, X.6-X.9.
      Children of Conan of Brittany, by Ermengarde d'Anjou:
      i. GEOFFROI I, Duke of Brittany [see next].
      ii. JUDITH OF BRITTANY, married RICHARD II, Duke of Normandy [see Appendix, Line A, Gen. 10].”

      3. “Royal Ancestry: A Study in Colonial & Medieval Families,” Douglas Richardson (2013):
      “ERMENGARDE OF ANJOU, married CONAN I, Duke of Brittany, Prince of the Bretons [see RICHMOND 1], son and heir of Juhel (alias Berenger), Count of Rennes. They had four sons, Geoffroi (I) [Duke of Brittany), Judicael [Bishop of Vannes], Catuallon [Abbot of Redon], and Urvod, and one daughter, Judith. He was present at the court of Eudes, Count of Chartres, in 979. In 981 he fought a battle against Guerech, Count of Nantes, and his Angevin allies, which is called the "first" Battle of Conquereuil. In 990 he made a donation to Mont Saint-Michel. CONAN I, Duke of Brittany, was slain at the 2nd Battle of Conquereuil near Nantes 27 June 992.
      Anselme Hist. de la Maison Royale de France 6 (1730): 3-21 (sub Anjou). Morice Mémoires pour servir de preuves à l'Histoire ecclésiastique et civile Bretagne 1 (1742): 350-351. Guérard Cartulaire de l'Abbaye de Saint-Père de Chartres 1 (1840): 66. Marchegay & Salmon Chroniques d'Anjou (1856): lxxii. Recueil des Historiens des Gaules et de la France 10 (1874): 175 (Ex Chronico S. Michaelis: "DCCCCXCII [A.D. 992]. Secundum bellum fuit in Concurrum, in quo Fulco Comes Andegavensis victor extitit; et Conanus Brito occisus est: Kal. Julii [1 July] filius Juhelli Berengarii."), 294 (Ex Chronico Kemperlegiensi: "Anno DCCCCXCII [A.D. 992]. Obiit Conanus Comes filius Judicaelis Berengarii Comitis Rhedonensis in bello Concurruc occisus est v Kal. Julii [27 June]."). Recueil des Historiens des Gaules et de la France 23 (1894): 579 (Notæ Monasterii Montis Sancti Michaelis: "28 Jun. [Obiit] Conanus, comes Britanniæ, qui jacet in capella Sancti Martini in ista ecclesia."). Rene Poupardin, "Généalogies angevines du XIe Siècle," in Mélanges d'Archéologie et d'Histoire 20 (1900): 199-208. Halphen & Poupardin Chroniques des Comtes d'Anjou et des Seigneurs d’Amboise (1913): 247-250 (Genealogiæ Comitum Andegavensium). Brandenburg Die Nachkommen Karls des Großen (1935), IX 8. Schwennicke Europäische Stammtafeln 2 (1984): 75 (sub Brittany); 3 (1984): 116 (sub Anjou). Winter Descs. of Charlemagne (800-1400) (1987): IX.3, X.6-X.9. Bachrach Fulk Nerra (1993). Keats-Rohan Family Trees & the Roots of Politics (1997): 211-267.
      Children of Ermengarde of Anjou, by Conan I of Brittany:
      i. GEOFFROI I, Duke of Brittany, married HAWISE OF NORMANDY [see RICHMOND 2].
      ii. JUDITH OF BRITTANY [see next].”