Ireland Timeline

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c. 7000 BCE - 6500 BCE

First human beings appear in Ireland.
c. 4200 BCE - c. 2200 BCE

Construction of the Great Megaliths of Ireland.
c. 4000 BCE

Transition in Ireland from hunter-gatherer to agrarian society.
c. 3200 BCE

The megalithic monument Newgrange is built in County Meath, Ireland.
c. 2700 BCE

The Giant's Ring Henge constructed in Ireland.
c. 2500 BCE

Knowledge of metal working evident in Ireland.
c. 2500 BCE

Immigration of the Beaker People to Ireland.
c. 2200 BCE

The wheel in use in Ireland.
c. 500 BCE - c. 300 BCE

The arrival of the Celts in Ireland.
c. 227 CE - c. 266 CE

Life of Cormac MacArt, High King of Ireland, known as The Lawgiver in creating the Brehon Codes.
c. 350 CE - c. 950 CE

Estimated use of the Ogham in Ireland and southwestern England.
c. 400 CE - c. 450 CE

Christian Missionaries arrive in Ireland, literacy spreads.
c. 432 CE

St. Patrick comes to Ireland, lights fire announcing Christianity on Hill of Slane.
795 CE

First recorded Viking invasion of Ireland.
795 CE - 1014 CE

The Viking Age in Ireland.
1014 CE

The Battle of Clontarf between Brian Boru, High King of Ireland, and the Vikings with Irish allies.