The High Kings of Medieval Ireland

1st High King: Máel Sechnaill mac Máele Ruanaid
Reigned:846-860
2nd High King:Áed Findliath
Reigned:861-876
3rd High King:Flann Sinna
Reigned:877-914
4th High King:Niall Glúndub
Reigned:915-917
5th High King:Donnchad Donn
Reigned:918-942
6th High King:Congalach Cnogba
Reigned:943-954
7th High King:Domnall ua Néill
Reigned:955-978
8th High King:Máel Sechnaill mac Domnaill
Reigned:979-1002,Restored 1014-1022
9th High King:Brian Bóruma
Reigned: 1002-1014
10th High King:Donnchad mac Briain
Reigned: Somewhere around 1064
11th High King:Diarmait mac Maíl na mBó
Reigned: Somewhere around 1072
12th High King:Toirdelbach Ua Briain
Reigned: Somewhere around 1086
13th High King:Domnall Ua Lochlainn
Reigned: Somewhere around 1121
14th High King:Toirdelbach Ua Conchobair
Reigned:1121-1156
15th High King:Muirchertach Mac Lochlainn
Reigned:1156-1166
16th High King:Ruaidrí Ua Conchobair
Reigned:1166-1198