 <unk> was accused of murdering William , specifically by poisoning him through the communion <unk> . A fellow <unk> , <unk> , who had been a <unk> of the deceased archbishop , brought murder charges against <unk> . <unk> obtained a hearing on the charges at a royal council presided over by King Stephen of England at <unk> in 1154 , but Stephen 's subsequent death prevented a resolution . <unk> attempted to have the trial switched to an ecclesiastical court and was supported in his efforts by Archbishop Theobald of Canterbury . A trial was finally held in <unk> and <unk> 's <unk> did not produce any witnesses , but <unk> was unable to prove his innocence , prompting the transfer of the case to a papal court . No record of any judgment exists , but <unk> apparently appeared before two <unk> , Adrian IV and Alexander III . A further appeal to the papal court was referred to papal judges @-@ delegate between 1175 and 1180 . 
