See also
| Husband: | Eochaid + MUGMEDON (287-365) | |
| Wife: | Mong + FIONN (c. 420-378) | |
| Children: | Brion + (c. 440- ) | |
| Name: | Eochaid + MUGMEDON | |
| Sex: | Male | |
| Father: | - | |
| Mother: | - | |
| Birth | 0287 | |
| Occupation | King of Connacht | |
| Title | King of Connacht | |
| Death | 0365 (age 77-78) | Tara, Meath, Ireland |
| Name: | Mong + FIONN | |
| Sex: | Female | |
| Father: | Fiachach + MAC DAIRE (c. 395- ) | |
| Mother: | - | |
| Death | 0378 (age -43--42) | Inish Donglais, County Mayo, Ireland |
| Birth | 0420 (est) | |
| Name: | Brion +1,2 | |
| Sex: | Male | |
| Birth | 0440 (cal) | |
| Occupation | King of Connacht | |
| Title | King of Connacht | |
| Death | ||
| Cause: killed in Second Battle of Damchluain | ||
| Burial | Ross Camm | |
Earned his nickname "Slaves Lords" by slave raids on Roman Britain, in one of which he carried off and married a princess of the Ancient Britons called Carina, by whom he had a son.
By his wife, Carthann, daughter of a British king, Eochaid had the son Niall. By another wife, Mong Fionn, daughter of the King of Munster, Eochaid had four sons, Brian, Fiachar, Ailill, and Fergus. Mong Fionn was a bitter, jealous and ambitious woman, who set her heart upon having her son, Brian, succeed his father as Ard Righ. As Niall was his father’s favourite, Mong Fionn did not rest until she had outcast him and his mother, Carthann, and made Carthann her menial, carrying water to the court. The child was rescued by a great poet of that time, Torna, who reared and educated him. When he had reached budding manhood, Torna brought him back to court to take his rightful place - much to his father’s joy. Then Niall, showing strength of character, even in his early youth, took his mother from her menial task, and restored her to her place.
Ancestors of Eochaid are based on myth and legend as recorded by 'The Annals of the Four Masters', which was compiled at least 600 years after the
facts.
was the 124th Monarch; and in the 8th year of his reign died a natural death at Tara, A.D. 365; leaving issue four sons, viz., by his first wife Mong Fionn:— I. Brian; II. Fiachra; III. Olioll; IV. Fergus. And, by his second wife, Carthan Cais Dubh (or Cariona), daughter of the Celtic King of Britain,— V. Niall Mór, commonly called "Niall of the Nine Hostages." Mong Fionn was dau. of Fiodhach, and sister of Crimthann, King of Munster, of the Heberian Sept, and successor of Eochaidh in the Monarchy. This Crimthann was poisoned by his sister Mong Fionn, in opes that Brian, her oldest son by Eochaidh, would succeed in the Monarchy. To avoid suspicion she herself drank of the same poisoned cup which she presented to her brother; but, notwithstanding that she lost her life by so doing, yet her expectations were not realised, for the said Brian and her other three sons by the said Eochaidh werew laid aside (whether out of horror of the mother's inhumanity in poisoning her brother, or otherwise, is not known), and teh youngest son of Eochaidh, by Carthan Cais Dubh, was preferred to the Monarchy. I. Brian, from him were descended the Kings, nobility and gentry of Conacht— Tirloch Mór O'Connor, the 121st, and Roderic O'Connor, the 183rd Monarch of Ireland. II. Fiachra's descendants gave their name to Tir-Fiachra ("Tireragh"), co. Sligo, and possessed also parts of co. Mayo. III. Olioll's descendants settled in Sligo— in tir Oliolla (or Tirerill). This Fiachra had five sons:— 1. Earc Cuilbhuide; 2. Breasal; 3. Conaire; 4. Feredach (or Dathi); and 5. Amhalgaidh.3
| 1 | "The Violent Death of Crimthann mac Fidaig and of the Three Sons of Eochaid Muigmedon". |
| 2 | "Wikipedia". |
| 3 | John O'Hart, "Irish Pedigrees" (1892). |