The term ‘Confederation of Kilkenny’ is not of ancient lineage. It dates from the nineteenth century and, as Professor J. C. Beckett has pointed out, seems to have originated in the title of a book by Father C. P. Meehan first published in 1846. Those members of the confederacy which ruled the major portion of the country between the rising of 1641 and the advent of Cromwell officially designated themselves as ‘the Confederate Catholics of Ireland’. Their own description of themselves has been chosen to head this essay not because the pedigree of the term ‘Confederation of Kilkenny’ is insufficiently old or respectable, but simply because their official title accurately describes what the essay is about. It is not concerned with the general history of the Confederate movement, nor with its prolonged diplomatic activities; still less does it deal with the ebb and flow of its military fortunes; nor even with the governmental structures of the Confederation. Of course I am relying on all these for background information and illustration, and, in particular, use has been made of the fact that I have been able to determine the number, and to identify almost the entire personnel, of the Confederation’s successive Supreme Councils. The history of the Confederation, political, diplomatic, constitutional and military, has been taken for granted. I want, then, to look at the people who individually bound themselves together by oath to form the confederacy; more particularly, to look at those who were members of the General Assemblies—constituting, in effect, the Confederate parliament; and more particularly still, to look at the members of the Supreme Councils, which virtually constituted the Confederate governments. This essay, therefore, is concerned with persons—with ‘the Confederate Catholics of Ireland’. It will briefly discuss their family origins, their educational and cultural background, their professions or occupations, and finally their political outlook.