midway through june, john was forced to accept the terms of his opponents, and so confirmed the charter of liberties known as "magna carta", a concession that led most of the rebel barons to renew their pledges of homage to him. alan's involvement in the negotiations is evidenced by the fact that he was in the king's presence in windsor on 3 june, when he is recorded to have exchanged gifts with the king. furthermore, alan's name is one of twenty-seven advisors recorded in the preamble of the charter, revealing that he was one of the magnates who counselled the king regarding the document. clear evidence of alan's influence on the deliberations may be the inclusion of a provision—clause fifty-nine—requiring john to satisfy certain grievances claimed by alexander. by the end of june, alan was confirmed in his irish lands, whilst thomas received custody of the castle of antrim, and was granted an ulster lordship centred at coleraine. also in 1215, henry de loundres, archbishop of dublin, the justiciar of ireland, was ordered by the english crown to allow alan to transport goods between ulster and galloway.