 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.