Although the kingdom had essentially been restored, the Lombard War continued to occupy the kingdom's nobility. As the Templars and Hospitallers supported opposite sides, they also attacked each other, and the Templars broke the treaty with the Ayyubids by attacking Nablus in 1241. Conrad proclaimed that he had come of age in 1242, eliminating both Frederick's claim to the regency and the need for an imperial guardian to govern in his place, although he had not yet turned 15, the age of majority according to the customs of Jerusalem. Through Conrad, Frederick tried to send an imperial regent, but the anti-imperial faction in Acre argued that Jerusalem's laws allowed them to appoint their own regent. In June the "Haute Cour" granted the regency to Alice of Champagne, who, as the daughter of Isabella I, was Conrad's great-aunt and his closest relative living in the kingdom. Alice ordered Filangieri to be arrested, and along with the Ibelins and Venetians, besieged Tyre, which fell in July 1243. The Lombard War was over, but the king was still absent, as Conrad never came to the east. Alice was prevented from exercising any real power as regent by Philip of Montfort, who took control of Tyre, and Balian of Beirut, who continued to hold Acre.