Catherine d'Elgart, daughter of Bernard d'Elgart and Jeanne d'Olhasso, owners of the borde of Elgart in the quartier of Jaurmendy in the Aldudes.
Her godparents were Bertrand d'Etchegoin, owner of Ausquiechuhy, paternal uncle "a la mode Bretagne" and Catherine d'Olhasso, maternal aunt.