- King of Leinster
- King of Meath
- King of Munster
- King of Thomond
- King of Ulster
- Aileach - later Tír Conaill and Tír Eógain
- Airgíalla
- Ulaid
- Mide
- Laighin
- Osraighe
- Munster - including Ormond, Desmond and Thomond
- Uí Maine
- Connacht
Between the 8th and 12th centuries, various Ard Rí attempted unsuccessfully to impose their rule over all the kingdoms in Ireland. Among those whose efforts almost made this a reality were Flann Sinna, reigned 877-916); Niall Glúndub mac Áedo (916-919); Brian Bóruma mac Cennétig (1002-1014); Toirdhealbhach Ua Briain (1055-1086; and Toirdhealbhach Ua Conchobhair (1119-1156). The last of these kingdoms ceased to exist in the early 17th century. Further Irish kingdoms included:
- Aidhne
- Breifne
- Dál Fiatach
- Dál nAraidi
- Dál Riata (this kingdom spanned western Scotland and north-eastern Ireland)
- Desmond
- Dublin
- Fir Manach
- Meath
- Moylurg
- Uí Failghe