Bertrand de Joannesbelsena, son of Domingo de Joannesbelsena and Catherine de Gaudelatzbehere, owners of the borde of Gaudelatzbehere in the quartier of Jaurmendy.
His godparents were Bertrand, owner of Joannesbelsena, paternal uncle and Marie Sabine d'Etcheberry Goycuetta, maternal grandmother.