Vem daterade Vilhelm IX av Akvitanien?

Vilhelm IX av Akvitanien, född 22 oktober 1071, död 10 februari 1126, var regerande hertig av Akvitanien från 1088 till 1126, tillika greve av Poitiers från 1086.

Han var härförare för ett korståg 1101 och betraktas även som den förste occitanske trubaduren.

Dangereuse of L'Île-Bouchard (Poitevin: Dangerosa; 1079 – 1151) was the daughter of Bartholomew, Lord of L'Île-Bouchard and his wife Gerberge of Blaison. She was the maternal grandmother of 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 ("Dangerous") was a sobriquet she received for her seductiveness; her baptismal name may have been Amauberge or Amal(a)berge.