| Date | | | |
| 870 | | Ivar, styled king of the Normans of all Ireland, defeats and kills Aidell, King of Leinster. | |
| 872 | | Ostin McAulaffe succeeds his brother Ivar, and makes a successful expedition into North Britain against the Picts, but is killed by his own subjects on his return. | |
| 879 | | Aulaffe and his son Ivar sail to England with 200 , to aid their countrymen, Hinguar and Hubba, and return to Dublin next year laden with booty. Aulaffe soon after died. | |
| 883 | | The Danes of Dublin plunder the churches of Kildare and Naas. | |
| 883 | | Flan McMelaghlin, king of Ireland, defeated by the Danes of Dublin. | |
| 890 | | Armagh again plundered and burnt by the Danes of Dublin. Dublin city taken by Gregory, king of Scotland. | |
| 897 | | Ireland visited with a plague of strange worms, having two teeth, which devoured every thing green in the land; supposed to have been locusts. | |
| 902 | | A new fleet of Danes, which arrived on the coast of Leinster, to aid their countrymen of Dublin, were routed with great slaughter, near that city, by the Irish. | |
| 911 | | The Danes of Dublin invade South Wales, but are repulsed with loss. | |
| 915 | | St. Mary's Abbey, near Ostmantown, founded by the Danes | |