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| YEAR | DATE | EVENT | HEAD OF STATE |
| 379 | High Kingdom of Ireland | king Niall Noigillach | |
| 405 | king Nath I | ||
| 429 | king Loeguire mac Neill | ||
| 463 | king Ailill Motl mac Nath I | ||
| 483 | king Lugaid mac Loeguiri O'Neill | ||
| 507 | king Muirchertach macErcae O'Neill | ||
| 534 | king Tuathal Maelgarb macCorpri Caech O'Neill | ||
| 544 | king Diarmait macCerbaill O'Neill | ||
| 565 | king Domnall macMuirchertaig O'Neill and Forggus macMuirchertaig O'Neill | ||
| 566 | king Ainmere macSatnai O'Neill | ||
| 569 | king Baetan macMuirchertaig O'Neill and Eochaid macDomnaill O'Neill | ||
| 572 | king Baetan macNinnedo O'Neill | ||
| 581 | king Aed macAinmerech O'Neill | ||
| 598 | king Aed Slaine macDiarmao O'Neill | ||
| 604 | king Aed Uaridnach macDomnaill O'Neill | ||
| 612 | king Mael Cobo macAedo O'Neill | ||
| 615 | king Suibne Menm macFiachnai O'Neill | ||
| 628 | king Domnall macAedo O'Neill | ||
| 642 | king Conaill Coel macMaele Cobo O'Neill and Cellach macMaele Cobo O'Neill | ||
| 654 | king Cellach macMaele Cobo O'Neill | ||
| 656 | king Cellach macMaele Cobo O'Neill and Diarmait macAedo Slaine O'Neill and Blathmac macAedo Slaine O'Neill | ||
| 658 | king Diarmait macAedo Slaine O'Neill and Blathmac macAedo Slaine O'Neill | ||
| 665 | king Sechnussach mac Blathmaic O'Neill | ||
| 671 | king Cen Faelad mac Blathmaic O'Neill | ||
| 675 | king Finsnechtae Fiedach macDunchada O'Neill | ||
| 695 | king Loingsech macOengus O'Neill | ||
| 704 | king Congal Cinn Magir macFergus Fanat O'Neill | ||
| 710 | king Fergal macMaele Duin O'Neill | ||
| 722 | king Fogartach macNeill O'Neill | ||
| 724 | king Cinaed mac Irgalaig and Flaithbbertach macLoingsig O'Neill | ||
| 728 | king Flaithbbertach macLoingsig O'Neill | ||
| 734 | king Aed Allan macFergal O'Neill | ||
| 743 | king Domnall Midi O'Neill | ||
| 763 | king Niall Frossaich mac Fergal O'Neill | ||
| 770 | king Donnchad Midi macDomnaill Midi O'Neill | ||
| 797 | king Aed Oirdnide macNeill Frossach O'Neill | ||
| 819 | king Conchobar macDonnchado Midi O'Neill | ||
| 833 | king Niall Caille macAedo Oirdnide O'Neill | ||
| 846 | king Mael Sechnaill macMaele Ruanaid O'Neill | ||
| 862 | king Aed Findliath macNeill Caille O'Neill | ||
| 879 | king Flann Sionna macMaele Sechnaill O'Neill | ||
| 916 | king Naill Glundubh macAedo Findliath O'Neill | ||
| 919 | king Donnchad Donn macFlann O'Neill | ||
| 944 | king Congalach Cnogba macMael Mithig O'Neill | ||
| 956 | king Domnaill macMuirchertaig O'Neill | ||
| 980 | king Mael Schnaill macDomnaill O'Neill (I) | ||
| 1002 | king Brian Boruma mac cennetig O'Neill | ||
| 1014 | king Mael Schnaill macDomnaill O'Neill (II) | ||
| 1022 | Division in kingdom of Munster, Leinster, Connacht and Ailech | king Donnchad MacBrian king of Munster |