The Irish Royal Families were dynasties who ruled large overkingdoms and smaller petty kingdoms on the island of Ireland over the last two millennia.
Significant kingdoms known from early historical times (2nd–7th centuries) included Eóganachta, Corcu Loígde, Connachta, Uí Fiachrach, Breifne, Aileach, Airgíalla, Dál Riata, Ultonia, Brega, Mide, Laigin, Osraige, Laois, Muma, Iarmuman, Desmumu, Tuadmumu, Hy Many. Some disappeared or were annexed; others were self-governing until the end of the 16th century.
The Irish kings of Tara were often recognised as supreme kings of the island from the time of Mael Seachnaill I (9th century), but the usual reality is that they were kings with opposition, ruling maybe two or three of Ireland's five provinces. Since the Norman Invasion no native Irish king, has ruled as a united sovereign Irish kingdom or state, although the Kingdom of Tyrconnell maintained occasional international relations and exchanged ambassadors with the Royal Courts of Scotland, Spain, and the Papacy. As was the case with the nations in what is now England, Scotland and Wales, the more powerful of the kingdoms of Ireland all regarded themselves as fully independent entities, rather as Germany was until 1871. In several cases they claimed utterly different racial backgrounds from neighbours; Ireland being home to races such as the Delbhna, Conmaicne Mara, Cruithne, Eóganachta or Deirgtine, Érainn, Fir Bolg, Grecraighe, Laigin, Ulaid, Mairtine, Dáirine, and a host of others. Few claimed to be homogeneous, despite later attempts to make them so.