Commentary
Conan I is called a son of Bérenger in a letter of pope John XIII and a son of Juhel Bérenger in Chronicum S. Michaelis and other Breton sources. He has been called son of Judicaël Bérenger, e.g., Chronicum Kemperlegiensi, which however, refers to Conan's son Geoffroy as "filius Conani filii Juhaëli Berengarii"]. His mother is not known. Cawley says his mother is Gerberge under Dukes of Brittany, but does not lists any spouses or mistresses for his father.
Family
ClaimDetailEvidence
FatherJuhel, Count of Rennes (e900-~970) [S915]
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Spouse 2ndErmengarde d’Anjou (e965-) 
Child +Geoffroy de Bretagne, Duke of Brittany (~980-1008) [S756] [S915]
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Child +Judith of Brittany (~982-1017) [S756] [S915]
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Attributes
ClaimDetailEvidence
GenderMale
NameConan de Rennes , Duke of Brittany [S915]
Nickname: Conan le Tort
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NameConan I, of Rennes [S756]
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NameConan `le Tort`, Count of Rennes [S756]
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NameConan I, Count of Rennes [S756] [S1344]
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NameConan Comte de Rennes [S1539]
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FatherJuhel, Count of Rennes (e900-~970) [S915]
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TitleCount of Rennes [S756] [S915]
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Timeline
ClaimDateDetailAgeEvidence
Birthest 938 (922-954)
 
Title 970 to 990Duke of Brittany [S756] [S915]
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Marriage 2nd973Ermengarde d’Anjou (e965-) [S915] [S1539]
Foundation of Medieval Genealogy (Medieval Lands - Brittany: Dukes) says 973, but mother was born in 950, so Erm could not have been born before 965.
negative
Marriage 2nd980Ermengarde d’Anjou (e965-) [S756]
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DeathJun 27, 992Conquereil, France [S756] [S915]
killed in battle
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Sources
IndexTitle
[S756] Weis, Frederick Lewis, "Ancestral Roots of Sixty Colonists Who Came To New England before 1700, 7th Ed." (Genealogical Publishing Co., Inc., Baltimore, 1999).
[S915] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Brittany: Dukes)" (2006-7 (v1.3 Updated 21 July 2007)) (https://fmg.ac/Projects/MedLands/BRITTANY.htm).
[S1344] Baldwin, Stewart, "The Henry Project - Conan I" (November 25, 2007) (https://fasg.org/projects/henryproject/data/conan000.htm).
[S1539] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Anjou Counts)" (v1.5 Updated 16 March 2010) (https://fmg.ac/Projects/MedLands/ANJOU, MAINE.htm).