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Marie-Marguerite Fontaine dit Bienvenue was born in Varennes, Quebec, Canada. She died in Quebec, Canada. She was the daughter of Pierre Fontaine dit Bienvenue and Marguerite Anthiaume (c1659-1699).
Marie-Marguerite Fontaine dit Bienvenue's husband was Paul DesMarais (1687-?). They were married 23 APR 1715 in Vercheres, Quebec, Canada. They had one known child named Marie-Therese Desmaris (1719-?).