[1] According to the Ex Gestis Comitum Barcinonensium, she was the second daughter and fourth of nine children of the troubadour king, Alfonso II of Aragon and his wife Sancha of Castile.
According to the Crónica of San Juan de la Peña, her brother Peter II sealed the union of Eleanor, with Raymond VI of Toulouse, Duke of Narbonne and Marquis of Provence, in order to put an end to the dissensions with the counts of Toulouse.
Eleanor was Raymond VI's 6th wife, having divorced an unknown daughter and sole heiress of Emperor Isaac Komnenos of Cyprus just two years earlier.
By this marriage she became countess of Toulouse which would suffer the pangs of the war and the Albigensian Crusade, in the following years.
The crusade was initiated by Pope Innocent III and headed by the French Crown against Toulouse and Catharism.