Eleanor of Aquitaine became the duchess of Aquitaine when her father, William X, died in 1137, according to History.com and the Brooklyn Museum. Three months later, she married Louis VII of France. As a duchess and the queen consort of France, Eleanor made a point to protect her rights to Aquitaine. In this historical “prenup,” Eleanor and Louis VII agreed that Aquitaine and France would remain independent until Eleanor gave birth to a son, who would become the king of France and duke of Aquitaine. The agreement turned out in her favor. In 1152, their marriage was annulled on the grounds of consanguinity, and Eleanor kept her title as duchess and the rights to Aquitaine. It wasn’t long before Eleanor became queen once again; that same year she married Henry II of England.