Arnaud de Lévézou son of Aicfred of Lévézou (Rouergue

Rouergue

Rouergue is a former province of France, bounded on the north by Auvergne, on the south and southwest by Languedoc, on the east by Gévaudan and on the west by Quercy...

) and of Arsinde de Millau, was the scion of a powerful family who had fortified Lévézou in the preceding century.

Arnaud was prior of the abbey of Cassan, bishop of Béziers (1095/6) and Archbishop of Narbonne (16 April 1121) and a papal legate

Papal legate

A papal legate – from the Latin, authentic Roman title Legatus – is a personal representative of the pope to foreign nations, or to some part of the Catholic Church. He is empowered on matters of Catholic Faith and for the settlement of ecclesiastical matters....

. His cousin Richard de Millau (died 15 February 1121) preceded him as Archbishop of Narbonne. During the minority of the viscountess Ermengarde of Narbonne

Ermengarde of Narbonne

Ermengarde , was a viscountess of Narbonne from 1134 to 1192...

 from 1134, Arnaud encouraged the regency of Alphonse I of Toulouse

Alphonse I of Toulouse

Alfonso Jordan was the Count of Tripoli from 1105 until 1109 and thereafter Count of Toulouse until his death. He was the son of Raymond IV of Toulouse by his third wife, Elvira of Castile, was born in the castle of Mont-Pelerin, Tripoli, in today's Lebanon...

, who invaded Narbonne in 1139 with the support of the Archbishop, whom he made governor of Narbonne.