Commentary
Charles Cawley states that his parents are not known, but Stewart Baldwin says the name of Alain's father is given by an eleventh century Angevin document,which states that he was an illegitimate son of an otherwise unidentified Ridoredh, and brother of Pascweten. The fact that Alain was a brother of Pascweten is confirmed by contemporary sources.
Family
ClaimDetailEvidence
FatherRidoredh (e807-) [S1479]
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SpouseOreguen (e843-) 
Child +_____ de Bretagne (e873-) [S915]
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Attributes
ClaimDetailEvidence
GenderMale
NameAlain I, 'le Grand' Duke of Brittany [S915]
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NameAlain I, 'le Grand' Count of Vannes [S1479]
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NameAlain I, Duke of Brittany
Nickname: Alain le Grand (the Great)
no source
FatherRidoredh (e807-) [S1479]
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Timeline
ClaimDateDetailAgeEvidence
Birthest 842 (827-857)
 
Titleabt 876Duke of Brittany [S915]
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Death907 [S915]
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Sources
IndexTitle
[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).
[S1479] Baldwin, Stewart, "The Henry Project - Alain I" (undated (site last updated June 20, 2010)) (https://fasg.org/projects/henryproject/data/alain000.htm).