This new edition spans the entire Henry Cromwell collection in the three Lansdowne volumes and covers all 536 seventeenth-century items contained within them. The overwhelming majority of the letters are transcribed in full and the entire texts are reproduced here. In a small number of cases the contents are briefly noted; they are not calendared. This applies mainly to minor letters of recommendation, courtesy, or religious exhortation; letters which merely repeat the contents of an earlier letter by that author; some of the more minor letters dealing with disputes over private business affairs or land allocated in Ireland; and the miscellaneous items of non-correspondence. Thus, in this edition, items are either reproduced in full or they are briefly noted; no letter is partly transcribed and partly noted and no letter is calendared. The overwhelming majority of the items, either dated or closely datable, have been arranged in a single chronological sequence, while the few items that cannot be assigned a fairly narrow date range have been placed at the end, followed by the handful of miscellaneous items. Throughout, the aim has been to produce a readable and easily accessible edition of the correspondence, while broadly adhering to the principles and practices recommended in R. F. Hunnisett, Editing Records for Publication (London, 1977).