 It was long believed that their origins lay in Gascony.In 905 Sancho Garcés, a younger son of the dynasty founder, used foreign assistance to displace the Íñiguez ruler Fortún Garcés and consolidate the monarchy in his dynasty's hands.He would be viewed as founder of the dynasty, with several Iberian Muslim sources calling the family the "Banu Sanjo" ( - the descendants of Sancho) for several subsequent generations, while a 12th-century Tunisian chronicler of Al-Andalus, Ibn al-Kardabūs, would referred to Sancho III of Pamplona as "ibn Abarca" ( - son or descendant of "Abarca"), referencing a nickname originally borne by Sancho I in the naming of this "Banu Abarca" dynasty.