Barcelona was not the only power interested in conquering Tortosa. In 1086, it was besieged by King Peter I of Aragon. In 1134, his brother and successor, Alfonso the Battler, died at the Battle of Fraga, in the midst of a campaign directed towards Tortosa. In 1137, Aragon and Barcelona were united when Raymond Berengar IV was betrothed to Alfonso's niece, Queen Petronilla of Aragon. The count of Barcelona could thus draw on Aragonese resources for the conquest of Tortosa.