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In page Anselm of Canterbury:

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Anselm chose to depart in October 1097.[1] Although Anselm retained his nominal title, William immediately seized the revenues of his bishopric and retained them til death.[2] From Lyon, Anselm wrote to Urban, requesting that he be permitted to resign his office. Urban refused but commissioned him to prepare a defence of the Western doctrine of the procession of the Holy Spirit against representatives from the Greek Church.[3] Anselm arrived in Rome by April[3] and, according to his biographer Eadmer, lived beside the pope during the Siege of Capua in May.[4] Count Roger's Saracen troops supposedly offered him food and other gifts but the count actively resisted the clerics' attempts to convert them to Catholicism.[4]