 Though Walpole was no admirer of the schools he had attended there , the cathedral cities of Truro , Canterbury and Durham made a strong impression on him . He drew on aspects of them for his fictional cathedral city of <unk> in <unk> , the setting of many of his later books . Walpole 's memories of his time at Canterbury grew <unk> over the years ; it was the only school he mentioned in his Who 's Who entry , 
