La Ferté-sur-Aube, now known as Laferté-sur-Aube, is located about 15 kilometres south-east of Bar-sur-Aube, in the canton of Châteauvillain in the present-day French département of Haute-Marne.
The Acta Sanctorum commentary on the life of Saint-Simon de Valois, based on an undated manuscript of the abbey of Saint-Claude, names "Achardi" as the ancestor of the comtes de Bar-sur-Aube who are set out below, stating that he was "genere Normannum" and that he founded "Firmitatis ad Albam" {La Ferté-sur-Aube}.
The Acta Sanctorum commentary on the life of Saint-Simon de Valois names "Achardia" as the wife of "Achardi". The name is improbable, as it appears to be the feminine version of her husband’s name. 1