Brian Felled Brodir

The One King
23, April, 1014: King Brian Boru doesn't pray at the Battle of Clontarf, thus he is ready whe Brodir attacks him, brodir is killed. The Battle of clontarf is a sweeping victory for Boru.

1019: The Battle at Tara, a sweeping victory for Boru, leads to the death of the opposition.

1021: Brian Boru declares himself the One King, or Aon Rí, of Eire. No other king is allowed. Instead, the Four Kings become the Iarlas, the High King becomes the Ard Tiarna. The chieftains (such as the Ui Fergusa) are renamed the Tiarnas.

1102: The third Ui Boruma Aon Rí, Conall, builds the Rí Pálás, or King's Palace, in Dubh Linn

1119: The Iarla of Munster sets up permanent residence in Cork.

1127: The Iarla of Connacht sets up permanent residence in Limerick

1139: The Iarla of Lienster sets up residence in Dubhlin

1148: The Iarla of Ulster sets up residence in Doire.

1168: The Ard Tiarna moves from Tara to Dublin.

1221: The Fifth king of the Ui Boruma, Brian III, assumes the titles of bot Aon Rí and Ard Tiarna.

1223: Brian III abolishes the title of Ard Tiarna, so that all the Iarlas report directly to the King.