| Father | Niall of the Nine Hostages,, High King of Ireland (b. 311, d. 378) |
| Mother | Queen Roighneach ingen Noigialch, Meadaib (b. 350, d. 420) |
| Son | Prince Conall Cremthainne Mac- Niall of Ireland+ (b. UM 0400) |
| Pedigree Chart |
| Birth | 377 | Kings of Ailech Eoghan O'Neill was born in 377 in Galway, Co. Tyrone, Dál Riata Kingdom (Ireland)BG. |
| Christening | 377 | He was christened in 377 in Argyll and Bute, Scotland, United KingdomBG. |
| Death | 465 | He died in 465 at age ~88 in Grianán of Aileach, Co. Donegal, Kingdom of Aileach (Ireland)BG. |
| Burial | 465 | He was buried in 465 in Eskaheen, Co. Donegal, Kingdom of Aileach (Ireland)BG. |
| Last Edited | 7 December 2020 |