A bibliography of the sources from which this book has been written would extend to many pages: much information has been derived from the collections of MSS. preserved in Paris in the BibliothÈque Nationale, in the Archives Nationales, and in the BibliothÈque Mazarine; from the valuable series of Roman Transcripts in the Public Record Office, London; from the curious and interesting documents in the archives of the See of Westminster, and from the newspapers and pamphlets which form a branch of the literature of the Civil War.

I have to express my thanks to His Eminence Cardinal Bourne, who kindly permitted me to consult the archives of the See of Westminster and to print three of the documents in the Appendix; to Mr. Edward Armstrong, Provost of Queen's College, Oxford, and to the Rev. H. Thurston, S.J., who have given me much help and advice; to the nuns of the Convent of the Visitation, Harrow-on-the-Hill, who lent me the rare Vie de la Ven. MÈre Louise EugÉnie de la Fontaine; and, finally, to my friend, Miss H. M. Morris, who with unwearied kindness read through nearly the entire MS. of the book, and helped me much by her criticisms and suggestions.