Aureolus is traditionally thought to have been the chief of the Franks

Franks

The Franks were a confederation of Germanic tribes first attested in the third century AD as living north and east of the Lower Rhine River. From the third to fifth centuries some Franks raided Roman territory while other Franks joined the Roman troops in Gaul. Only the Salian Franks formed a...

 in the region of Aragón

Aragon

Aragon is a modern autonomous community in Spain, coextensive with the medieval Kingdom of Aragon. Located in northeastern Spain, the Aragonese autonomous community comprises three provinces : Huesca, Zaragoza, and Teruel. Its capital is Zaragoza...

.

Between 798 and 802 the Franks established several positions in the zone: Bahlul Ibn Marzuq

Bahlul Ibn Marzuq

Bahlul Ibn Marzuq was a Vascon-Muslim, the son of a local lord named Marzuq ibn Uskara . He rebelled in Zaragoza against the Arab-Muslim government of Al-Andalus in 798, and in 800 conquered Huesca from the Banu Salama. The emir sent the Huesca native, general Amrus ibn Yusuf, and Zaragoza and...

 revolted in Zaragoza

Zaragoza

Zaragoza , also called Saragossa in English, is the capital city of the Zaragoza Province and of the autonomous community of Aragon, Spain...

 against the central government of Muslim Al-Andalus in 798, and in 800 conquered Huesca

Huesca

Huesca is a city in north-eastern Spain, within the autonomous community of Aragon. It is also the capital of the Spanish province of the same name and the comarca of Hoya de Huesca....

 from the Banu Salama

Banu Salama

Banu Salama Tudjibid family that governed the regions of Huesca and Barbitanya in the Upper Mark of Al-Andalus c. 780-800. In 800 Bahlul Ibn Marzuq, revolted in Zaragoza, taking the region and the Banu Salama were deposed....

. General Amrus ibn Yusuf

Amrus ibn Yusuf

Amrus ibn Yusuf al-Muwalad was a Muwallad general of the Emirate of Córdoba and governor of Zaragoza.Amrus, a native of Huesca, and his kinsman Sabrit were servants of Aysun ibn Sulayman al-Arabi. The kinsmen joined Aysun's brother when Matruh al-Arabi rebelled and entered Zaragoza...

 (born in Huesca), sent by the Amir, conquered Zaragoza and Huesca (c. 801). Bahlul fled to Pallars and was killed by his lieutenant Jalaf Ibn Rashid

Jalaf Ibn Rashid

Jalaf ibn Rashid ibn Asad was a lieutenant of Bahlul Ibn Marzuq, the rebel leader of the Zaragoza region in Spain, who conquered Huesca in 800.When Bahlul was defeated by troops sent by the Spanish Wāli and fled to Pallars, he was killed by Jalaf ibn Rashid...

 (802), who at the time held Barbitanya (Barbastro

Barbastro

Barbastro is a city in the Somontano county, province of Huesca, Spain...

). With all this disturbances the Franks established control over Jaca

Jaca

Jaca is a city of northeastern Spain near the border with France, in the midst of the Pyrenees in the province of Huesca...

 and other castles and designated Aureolus as count of Aragón.

After Aureolus died in 809 the Frankish lobby secured succession for Aznar Galíndez I, but Amrus ibn Yusuf overran the county of Sobrarbe

Sobrarbe

Sobrarbe is one of the Comarcas of Aragon, Spain. It is located in the northern part of the province of Huesca, part of the autonomous community of Aragon in Spain...

, which was not reconquered by Aznar until 814.