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7000 BCE - 6500 BCE: First human beings appear in Ireland.
4200 BCE - 2200 BCE: Construction of the Great Megaliths of Ireland.
4000 BCE: Transition in Ireland from hunter-gatherer to agrarian society.
3200 BCE: The megalithic monument Newgrange is built in County Meath, Ireland.
2700 BCE: The Giant's Ring Henge constructed in Ireland.
2500 BCE: Knowledge of metal working evident in Ireland.
2500 BCE: Immigration of the Beaker People to Ireland.
2200 BCE: The wheel in use in Ireland.
500 BCE - 300 BCE: The arrival of the Celts in Ireland.
227 CE - 266 CE: Life of Cormac MacArt, High King of Ireland, known as The Lawgiver in creating the Brehon Codes.
350 CE - 950 CE: Estimated use of the Ogham in Ireland and southwestern England.
400 CE - 450 CE: Christian Missionaries arrive in Ireland, literacy spreads.
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.