When Robert Michel Guy Tréguier was born on 1 October 1918, in Brest, Brittany, France, his father, Michel Jérôme Tréguier, was 34 and his mother, Marie Marguerite Ménez, was 21. He married Simone Louise Josette Lothon on 2 August 1949, in 16th Arrondissement, Paris, Seine, France. He died on 30 May 2010, in Le Mans, Sarthe, Pays de la Loire, France, at the age of 91, and was buried in Bergerac, Dordogne, Nouvelle-Aquitaine, France.