Sylvain Breau is on the Wall of Names at the Acadian Memorial in St. Martinville, Louisiana Plaque 2 Left. Listed with him is Isabelle Darois, his wife. 
Isabelle Darois, daughter of Jerome Darois and Marie Gareau was born in Acadie about 1698. She married Rene Trahan, son of Jean Trahan and Marie Boudrot 8 Nov 1717 at Saint Charles des Mines.  She bore 7 children, was widowed, remarried, was imprisoned, immigrated to Louisiana where she and many others in the group died soon after being settled in the Attakapas Territory. Some of her children immigrated to Louisiana but two others were deported to France.
Isabelle died 10 October, 8 months after arrival in Louisiana and was buried soon after. 
Marriage (1) Rene TRAHAN 8 Nov 1717 in Grand Pré, Acadia, 7 known children. 
Children-all born in Acadie, Nouvelle-France
Jean TRAHAN b: 18 Mar 1719
Marie TRAHAN b: 17 Sep 1721
Paul TRAHAN b: 16 Dec 1723
Michel TRAHAN b: Abt 1726
Joseph TRAHAN b: Abt 1728
Ursule TRAHAN b: Abt 1730
Rene TRAHAN b: Abt 1732
Marriage (2) Sylvain Breau 6 Jun 1734 in Beaubassin, Acadie 
Census: 12 Aug 1763 Halifax, Nova Scotia, Canada 
Immigration: Feb 1765 New Orleans, Orleans with a group led by Joseph Broussard where in April 1765, Silvain Braud received a receipt for 1208 livres in ordonnances and 1130 livres 10 sols in billetes [receipts] in Canadian money.
↑ Title: The Wall of Names at the Acadian Memorial; Author: Wall of Names Committee; Jane G. Bulliard, Chair; second edition, 2015; Bodemuller The Printer, USA; Personal copy in possession of Jacqueline Girouard; p. 13
↑ Title: Dictionnaire Généalogique des Familles Acadiennes; Author: Stephen A. White; Publication: 2 vols., Moncton, New Brunswick: Centre d'Études Acadiennes, 1999. Copy in possession of Jacqueline Girouard; pp. 470 & 1541.
↑ Title: Acadian Church Records, vol. II; Author: Milton P. and Norma Gaudet Rieder; Publication: Metairie, LA: Authors, 1976; Note: Covers year 1712-1748. Includes transcripts of Beaubassin, Acadia church registers, now at the Archives of the Mayor of La Rochelle, Charente Maritime, France. Source published by Karen Theriot Reader, RootsWeb.com; p. 42
Text: Witnesses: Joseph VIGNEAU; Joseph HUGUN [sic].
↑ [Note: She was the widow of Rene Trahan and the 6 children are from that marriage.] Title: Acadian Exiles in the Colonies; Author: Janet Jehn; Publication: Covington, KY: Author, 1977; Personal copy in possession of Jacqueline Girouard; p. 251
Text: Cyles BRAU widow (sic), six children.
↑ See here for a scan of the document provided by the Acadian Museum in Erath, Louisiana. The document is on a microfilm "France, Archives des Colonies, C 13a Louisiana General Correspondence v. 45 p. 29".
↑ Posting by Roger Rozendal in Jun 2006, ACADIAN-CAJUN@rootsweb.com. regarding the Acadians who were imprisoned by the British in Acadie and later immigrated to Louisiana. Sylvain and Isabelle aren't mentioned specifically in the article however.
Text: Sylvain and his wife came to New Orleans, Louisiana in February 1765 with Joseph Broussard where in [5?] April 1765, he received a receipt for 1208 livres in ordonnances and 1130 livres 10 sols in billetes [receipts] in Canadian money (RECEIPTS April 1765). They then went on to Attakapas with Joseph Broussard. There on 10 October 1765, Isabelle Darois was buried (SM Ch.: Slave Funeral Register v. 1, #25; SM Ch.: v. 1, p.13-Hebert v. 1A p. 216) and two days later on 12 October 1765, Sylvain Breau was buried (SM Ch.: Slave Funeral Register v. 1, #24; SM Ch.: v. 1, p. 13-Hebert v. 1A p. 116).
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It may be possible to confirm family relationships with Isabelle by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share DNA with Isabelle: