8000 BC - Mesolithic hunter gathers arrive in Ireland.
4000 BC - Neolithic farmers arrive in Ireland.
3200 BC - Passage tombs in the Boyne Valley constructed (Newgrange
2500 BC - Early Bronze Age - The first metalworkers learned how to extract copper ore from rock. The earliest known copper mine was at Ross Island, Killarney, Co. Kerry.
2400 BC - The first goldsmiths collected gold from rivers which they melted into ingots and hammered into shape to make sheet gold objects.
2200 BC - Metalsmiths learned to mix tin with copper producing a stronger metal called bronze.
500 BC - The Iron Age and the arrival of the Celts.
433 - St. Patrick's first converts to Christianity on the Hill of Tara
807 - Kells Monastery
founded by monks fleeing Viking attacks on Iona, an island off the Western coast of Scotland.
1541 - Henry VIII of England upgraded Ireland from a lordship to a full Kingdom. Henry was proclaimed King of Ireland at a meeting of the Irish Parliament.
1601 - The defeat of the Gaelic chiefs at the Battle of Kinsale.
1607 - The Flight of the Earls when Hugh O'Neill, Earl of Tyrone and Rory O'Donnell, 1st Earl of Tyrconnell, and about ninety followers left Ulster in Ireland for mainland Europe.
1641 - After a rebellion against Protestants, the Book of Kells was transferred to Trinity College in Dublin.
1845 - The Great Famine or the Great Hunger
- Mass starvation, disease, and emigration in Ireland between 1845 and 1850.
- 1 million people died and another 1.5 million emigrated, mostly to North America.
- Potato blight (phytophthora infestans) caused the failure of the potato crop which was the staple diet.
- Greatest impact in the west and south of Ireland, where the Irish language was primarily spoken.
- The worst year of the period was 1847 known as "Black 47".
1949 – Ireland officially became a Republic on April 18th, leaving the British Commonwealth.