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The Irish nobility consists of persons who historically fell into one or more of the following categories of nobility.
- Gaelic nobility of Ireland are those who qualified under the rules of tanistry, or otherwise were descendants in the male line of at least one historical grade of king (Rí).[clarification needed] This group includes the descendants of the Norse-Gaelic kings.
- Hiberno-Norman or Old English (Ireland) nobility, descendants of the settlers who came to Ireland from Wales, Normandy and England after the Norman invasions of England and Ireland in 1066 and 1169–71, respectively.
- Peerage of Ireland, whose titles were created by the English and later British monarchs of Ireland in their capacity as Lord or King of Ireland.
These groups are not mutually exclusive. There is a some overlap between the first two groups (prior to the Treaty of Limerick), and a lesser degree of overlap between the last two groups (prior to the declaration of the Republic of Ireland). Such overlaps may be personal (e.g. a Gaelic noble who was "regranted" his titles by King Henry VIII of England), or they may be geographical[clarification needed] (i.e. different noble traditions co-existing in neighbouring parts of the country, which were only distinguished by the date when they finally fell under the Dublin Castle administration).
In the Republic of Ireland, as a republic, the Irish Constitution precludes the state from conferring titles of nobility, and prevents citizens from accepting titles of nobility or honour – except with the prior approval of the government. While some representatives of clans and families had obtained "courtesy recognition" as Chiefs of the Name from the Chief Herald of Ireland, this practice was discontinued by 2003 – with the Attorney General noting that such recognitions were unconstitutional and without basis in law. In Northern Ireland however, as part of the United Kingdom of Great Britain and Northern Ireland, certain titles are still used and awarded.
- "40.2" (PDF), Constitution of Ireland, Dublin: Stationery Office, archived from the original (PDF) on 2009-07-30
- Curley. "Charles Lysaght (in Curley), p. 14". Vanishing Kingdoms: The Irish Chiefs and Their Families. pp. 179–80.
- "Genie Gazette" (PDF). 8 (10). Genealogical Society of Ireland. October 2003.
- "Terence of Belfast - The Kingdom of Desmond Association". Desmondasn.webs.com. Retrieved 2016-01-16.