Dangereuse de Chatelherault

Dangereuse de l'Isle Bouchard (Poitevin: Dangerosa; 1079-1151) was the daughter of Bartholomew de l'Isle Bouchard. She was the maternal grandmother of the celebrated Eleanor of Aquitaine. She was also mistress to her granddaughters' paternal grandfather William IX, Duke of Aquitaine. As the mistress of William the Troubadour, she was known as La Maubergeonne for the tower he built for her at his castle in Poitiers. Dangereuse was a sobriquet she received for her seductiveness; her baptismal name may have been Amauberge.

Dangereuse's paternal grandparents were Archimbaud Borel de Bueil and Agnes de l'Isle Bouchard. Through her granddaughter, Dangereuse was an ancestor of many monarchs and members of the nobility, including: Richard I of England, Marie, Countess of Champagne, John of England, Geoffrey, Duke of Brittany, Joan, Queen of Sicily, Eleanor, Queen of Castile, Matilda, Duchess of Saxony and Henry the Young King.

Her granddaughter Eleanor was Queen consort of France, Queen consort of England and Duchess of Aquitaine (in her own right).

Dangereuse married Viscount Aimery I of Châtellerault at an unknown date. She advised her husband to donate property to the priory of Saint Denis en Vaux in a charter dated 1109, which means they were married before this point. Dangereuse was a woman who did as she pleased and cared little for the opinion of her peers.