There have been duchesses of Bouillon, in present-day Belgium, since the tenth century.
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Ardennes-Bouillon dynasty, ?-1100
Sold to the Bishopric of LiègeHouse of Rohan, since 1816
The Congress of Vienna in 1816 awarded the title of Duke of Bouillon to the House of Rohan, descendants of Marie Louise de La Tour d'Auvergne.
References
Duchess of Bouillon Wikipedia(Text) CC BY-SA