| c. 7000 BC | Excavation at a settlement at Mount Sandel, Co. Derry showed that people lived there during the Mesolithic (Middle Stone Age). They were the earliest known inhabitants of Ireland so far and they survived by foraging for food. |
| c. 4200 BC | During the Neolithic (New Stone Age) in Ireland, people developed the skills of farming. |
| c. 2000 BC | Metalworking began in Ireland about this time. Copper was mined here at first and later mixed with imported tin to make bronze articles. This period is called the Bronze Age. |
| c. 600 BC | The technology of iron working began in Ireland about this time. Celtic culture was developing. |
| 500 AD | Christianity had been firmly established by St. Patrick and others. |
| 600 | Many early Christian monasteries had been founded. |
| 697 | Cáin Adomnáin - an early Irish law for the protection of women |
| 795 | First Viking raid on Ireland. |
| 821 | Vikings carry off a large number of women from Howth. |
| 841 | First Viking longphort in Ireland. |
| 1014 | Brian Boru killed at the Battle of Clontarf. |
| 1111 | Synod of Rathbreasail. Irish dioceses reorganised. |
| 1169 | Arrival in Ireland of Strongbow and the Normans. |
| c. 1200 | Stone castles being built. |
| 1315-8 | Bruce invasion. |
| 1348 | 'Black death' in Ireland. |
| 1366 | Statutes of Kilkenny. |