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Pierre Simon Guillet dit Lajeunesse was born ABT 1625 in La Rochelle, Aunis ou Saintonge, France. He died 8 MAY 1695 in Cap de la Madeleine, Canada. He was the son of Francois Guillet and Perrine Menard.
Pierre Simon Guillet dit Lajeunesse's wife was Jeanne St-Pere (1627-c1667). They were married 10 FEB 1642 in St-Jean-D'Angely, France. They had one known child named Louis Guillet dit Saint-Marc (1657-1730).