Arnau Ramon of Pallars Jussà

Arnau Ramon (died 1112) was the Count of Pallars Jussà from 1098 until his death. He was the second son of Ramon IV and co-ruled with his elder brother Pere Ramon until the latter's death in 1111. After this he was succeeded by his younger brother Bernat Ramon. There is preserved a document recording how Ramon IV exempted Arnau from owing his brother Pere potestas for the castle of Talarn:

Et mandavit Raimundus comes que non donasset potestatem Arnallus iamdictus de ipso castro de Talarn a Petro comite, si non erat bauzia conprobata. And Count Ramon ordered that the aforementioned Arnau should not give potestas for that castle of Talarn, unless he was proved a traitor.

The right of potestas ("power") was the right of a superior to assume direct control of a castle upon request.