Jean I de Dreux, Duc de Bretagne was born in 1217. He was the son of Pierre Mauclerc de Dreux, Duc de Bretagne and Alice de Thouars, Duchesse de Bretagne. He married Blanche de Navarre, daughter of Thibaut I (IV), Rey de Navarre. He died in 1286.
Jean I de Dreux, Duc de Bretagne also went by the nick-name of Jean 'the Red'. He was also known as Duc de Bretagne as of 1221.
ROYAL ANCESTRY by Douglas Richardson Vol. I, page 395
ROYAL ANCESTRY by Douglas Richardson Vol. I, page 548
↑ Hallam, Elizabeth M.; Everard, Judith (2001) . Capetian France, 987-1328. London: Longman. p. 273.
↑ Tim Boyle, "re: Boyle Family," e-mail message to Darryl Roger Lundy, 16 September 2006.
↑ John Morby, Dynasties of the World: a chronological and genealogical handbook (Oxford, Oxfordshire, U.K.: Oxford University Press, 1989), page 83.
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It may be possible to confirm family relationships with Jean I by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: