Princess Bertha de Rohan (1889-1977) (1889–1977) Parents Alain de Rohan, 12th Duke de Montbazon et de Bouillon Princess Johanna Auersperg Children Johanna Herzogenberg Siblings Alain Rohan, 13th Duke de Montbazon et de Bouillon Princess Marie de Rohan Princess Gabriele de Rohan Princess Johanna de Rohan Karl Anton Rohan Partners Ottokar Picot de Peccaduc Freiherr von Herzogenberg