This article concerns the Gaelic nobility of Ireland from ancient to modern times. It only partly overlaps with Chiefs of the Name because it excludes Scotland and other discussion. It is one of three groups of Irish nobility, the others being those nobles descended from the Hiberno-Normans and those granted titles of nobility in the Peerage of Ireland.
By the time of the Treaty of Limerick, almost all Gaelic nobles had lost any semblance of real power in their (former) domains. Today, such historical titles have no special legal status in the Republic of Ireland, unlike in Northern Ireland, which has remained a part of the United Kingdom of Great Britain and Northern Ireland. The Republic of Ireland does not confer titles of nobility under its constitution.
From 1943 until 2003 some of the modern representatives of the Gaelic nobility obtained a courtesy recognition as Chiefs of the Name from the Irish government. The practice ended in 2003 following certain scandals (Terence Francis MacCarthy) and under concerns that it was unconstitutional. Disputed titles, as well as those for whom recognition is still pending, are not listed.
Clann territories were under the rule and control of a Chief, who was elected by a vote of ancestral descendants (within three generations) of the preceding Chief. The designation as Chief was also referred to as a King (Ri), Lord (Tiarna), or Captain of his countries, all of which were roughly equivalent prior to the collapse of the Gaelic order. The concept of a hereditary "title" originated with the adoption of English law, the policy of surrender and regrant and the collapse of the Gaelic order during the period from approximately 1585–1610. Because the election of a new chief would almost always be from the same family (or families) within a tribal area, each family developed a long history of ruling within an area, which gave rise to the concept of Gaelic nobility. However, ruling titles did not pass by hereditary descent; rather it was by election and bloodshed, given the absence of criminal penalties for the death of an opponent.