Stephen's wishes, the King refused to allow him back into England either, and seized his estates. Stephen also cut his links to the Cistercian order, and turned instead to the Cluniacs, of which Henry was a member. Nonetheless, the pressure on Stephen to get Eustace confirmed as his legitimate heir continued to grow. The King gave Eustace the County of Boulogne in 1147, but it remained unclear whether Eustace would inherit England. Stephen's preferred option was to have Eustace crowned while he himself was still alive, as was the custom in France, but this was not the normal practice in England, and Celestine II, during his brief tenure as pope between 1143 and 1144, had banned any change to this practice. Since the only person who could crown Eustace was Archbishop Theobald, who refused to do so without agreement from the current pope, Eugene III, the matter reached an impasse. At the end of 1148, Stephen and Theobald came to a temporary compromise that allowed Theobald to return to England. Theobald was appointed a papal legate in 1151, adding to his authority. Stephen then made a fresh attempt to have Eustace crowned at Easter 1152, gathering his nobles to swear fealty to Eustace, and then insisting that Theobald and his bishops anoint him king. When Theobald refused yet again, Stephen and Eustace imprisoned both him and the bishops and refused to release them unless they agreed to crown Eustace. Theobald escaped again into temporary exile in Flanders, pursued to the coast by Stephen's knights, marking a low point in Stephen's relationship with the church. Treaties and peace (1153–1154) Henry FitzEmpress returned to England again at the start of 1153 with a small army, supported in the north and east of England by Ranulf of Chester and Hugh Bigod. Stephen's castle at Malmesbury was besieged by Henry's forces, and the King responded by marching west with an army to relieve it. He unsuccessfully attempted to force Henry's smaller army to fight a decisive battle along the river Avon. In the face of the increasingly wintry weather, Stephen agreed to a temporary truce and returned to London, leaving Henry to travel north through the Midlands where the powerful Robert de Beaumont, Earl of Leicester, announced his support for the Angevin cause. Despite only modest military successes, Henry and his allies now controlled the south-west, the Midlands and much of the north of