Note: We know they were in France and we know they emigrated to Louisiana. We don't know yet how they got to Louisiana. His birth date varies in sources from 1744 to 1759.
Note: Yves-Cypien and his first wife, Anne Margurite THIBODAUX (the widow of Charles Bourg), are listed as Nantes Exile Family 274. After Anne's death he marries Marie Marthe Degni 
Yves was born about 1758 in the Parish of St. Etienne Church of Rennes, France, son of Jean & Charlotte PINGRE. He was a hatter, resident of Parish of Ste. Croix of Nantes when he married on 1 Dec 1781 to Anne THIBODAUX, widow of Charles BOURG, daughter of Antoine & Suzanne COMMAUX.  He died October 2, 1829. 
Marriage (1) Marie Anne THIBODEAU 1 Dec 1781 in Nantes, Loire-Atlantique, France 
↑ Albert J. Robichaux, THE ACADIAN EXILES IN NANTES; 1775-1785; Harvey, LA, Author, 1978; p. 30, family #; Salt Lake Family History Library Europe 944.14 Dar. Anne THIBODAUX, daughter of Antoine & Suzanne COMMAUX, remarried on 1 Dec 1781 at St. Croix Church of Nantes, France, to Yves-Cyprien ROUXEAU (see family No. 274). p. 152, family #274:
↑ Title: South Louisiana Records, vol. 1, 1794-1840; Author: Donald J. Hebert; Publication: Rayne, LA, Hebert Publications, 1978; Contains church and civil records of Lafourche & Terrebonne Parishes; copy in possession of Girouard-4019; p. 470
Text: Yves ROUSSEAU of Reines [sic], France, died 2 Oct 1829 at age 75 years. (Thib.Ch.: v.1, p.49).
↑ Yves-Cypien Rousseau (1744-1829) on Find A Grave: Memorial #62948601 retrieved 24 June 2018 Find-a-Grave Memorial has a copy of his death certificate.
↑ Title: From Nantes to Louisiana, The history of Acadia: the odyssey of an exiled people; Author: Gérard-Marc Braud; English translation: Julie Fontenot Landry; Publication: La Rainette; Lafayette, Louisiana; Personal copy in possession of Girouard-4019; p. 84
Text: Yves-Cyprien ROUXEAU married on 1 Dec 1781 at Ste. Croix [Nantes] to Anne THIBODEAU.
↑ Title: Diocese of Baton Rouge Catholic Church Records; Author: Catholic Church; Vol 3, 1804-1819; Contains Baptismal, marriage and burial entries taken from some 46 registers housed in the Archives of the Diocese of Baton Rouge; copy in possession of Girouard-4019; p. 254
Text: Luc [sic], widower of Anne THIBAUDEAUX, son of Jean & Charlotte PINGRE of St. Etienne de Reims, Brittany, resident of Lafourche, married 20 Oct 1818 to Marie Marte DEGNI, daughter of Charles Marc & Marie CURE of New Orleans, resident of Lafourche. Witnesses: Etienne BOUDREAUX; Pierre LANDRY; Jean Pierre CLEMENT. Recorded (ASM-7, 31).
↑ Title: Louisiana Census and Militia Lists, vol. I; Author: Robichaux, Jr., Albert J.; Publication: Polyanthos, 1977; Note: 1770-1789, German Coast, New Orleans, Below New Orleans and Lafourche. The census dated here 1 Jan 1789 appears to have been taken at least as early as 1 Jan 1788. It is from: Papeles Procedentes de Cuba, Legajo 202. Source published by Karen Theriot Reader, RootsWeb.com. p. 144
Text: Ives BROUSSEAU [sic], age 38, listed with his wife Annette THIBEAUDEAU, age 31, and two sons in a household of 4 persons. They have 6 arpents of land, 30 quarts of corn, 2 head of cattle, and 11 hogs.
↑ Source: #AJRO BLaF p. 44, Left Bank (Original: Papeles Procedentes de Cuba, Legajo 201)
↑ Source: #AJRO BLaF p. 134 (Original: Papeles Procedentes de Cuba, Legajo 215A)
↑ "United States Census, 1810," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XH2C-43M : accessed 15 January 2017), Ives Rousseau, Assumption, Louisiana, United States; citing p. 28, NARA microfilm publication M252 (Washington D.C.: National Archives and Records Administration, n.d.), roll 10; FHL microfilm 181,355.
↑ "United States Census, 1820," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHLP-NWC : accessed 15 January 2017), Yves Rousseau, Assumption, Louisiana, United States; citing p. 30, NARA microfilm publication M33, (Washington D.C.: National Archives and Records Administration, n.d.), roll 30; FHL microfilm 181,356.
Yves-Cypien Rousseau (1744-1829) on Find A Grave: Memorial #62948601 retrieved 24 June 2018
Source: AJRO BLaF Title: Colonial Settlers along Bayou Lafourche, 1770-1798; Author: Albert J. Robichaux, Jr.’ Publication: Harvey, LA: 1974. 2nd printing Hébert Publications, 1980; Personal copy in possession of Girouard-4019;