 By the year 1000, the economic and social centre of Pallars was located in Pallars Jussà.It was wealthier than Pallars Sobirà and capable of expansion in the Reconquista against the Muslim territory to its south.During the eleventh century, the comital power in Pallars Jussà was violently reduced by the incessant attacks of Artau I of Pallars Sobirà in alliance with Ermengol III of Urgell.