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From one point of view, all that I have written is a commentary upon Thomas Stapleton's Observations on the Great Rolls of the Exchequer of Normandy. I join with Mr. Round in admiration for that great antiquary. His work was taken up and carried on by the young Leopold Delisle more than fifty years ago; and the frequent references to their work in the following pages testify both to the value of their labours and to the later neglect of Norman history.2 I owe most to Professor Haskins of Harvard, amongst modern scholars. He has kindly read several of the early chapters and given me much valuable criticism. Moreover, his essays upon the history of Normandy in the eleventh and early twelfth centuries are a sure foundation for any work upon a later period. The knowledge that he was continuing his elaborate labours upon Norman charters has ustified me in limiting the scope of the chapter upon Norman administration. My friends and teachers, Professor Tout, Professor Tait and Mr. H. W. C. Davis have added to a long series of kindnesses by reading and advising me upon various parts of the book. To Mr. Tout's unwearying encouragement I feel especially that I could never do justice in a preface My friend Professor Weaver, of Trinity College, Dublin, has also been good enough to read one or two chapters.
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