Eleanor (?)1
KING OF ORIEL and Giollaiosa (‘The Red’) O’Reilly.1 Dynast of E Breffny.1 With an elder son (Cu-Uladh.1 Earl of Ulster.1 Feudal baron of Navan) by his wife.1 Miles de Nangle.1 Daughter of Hugh de Lacy.1 In 1268 hostage for his father ).1 In 1283 and was himself killed by BRIAN MacMAHON.1
Children of Eleanor (?) and Aedh ‘Buie’, King of Ailech
Brian, King of Cenel Eoghain1 
It is from just before his time that the English Kings extended the benefit of English law to the ‘Five Bloods’ of Ireland (the old royal houses of O’Neill of Ulster, O’Melaghlin of Meath, McMurrough of Leinster, O’Brien of Munster and O’Conor of Connaught) so that they had the right to sue in English courts.1 He gained the title of King of Cenel Eoghain in 1291.1 He sought Norman help against his cousin King Domnall O’Neill.1
Children of Brian, King of Cenel Eoghain
Henry, King of Ulster1 
He was had a grant from Richard de Burgh, Earl of Ulster, of the territory of Glen Okenekahel (Glenconkeen) in present County Londonderry in 1313.1 In 1318 Chief or Prince of Clannaboy, to which territory he was towards the end of his life restricted as ruler, having previously taken advantage of Edward Bruce’s attack on the English in Ireland and the murder of the Red Earl of Ulster’s successor in 1333.1 He gained the title of King of Cenel Eoghain in 1325.1 He gained the title of King of Ulster in 1325.1 In 1344 deposed by the late King Domnall’s son Aedh O’Neill with Anglo-Norman help.1
Children of Henry, King of Ulster
- Muircheartach ‘Cennfhada’ O’Neill+2 d. 1395
- Brian O’Neill1 d. 1369
Muircheartach ‘Cennfhada’ O’Neill1 
He held the position of Chief of Clannaboy from in 1369.1
Children of Muircheartach ‘Cennfhada’ O’Neill
Brian ‘Ballach’ O’Neill1 
He held the position of Chief of Clannaboy from in 1395.1
Children of Brian ‘Ballach’ O’Neill
- Henry ‘Caech’ O’Neill2 d. 1465
- Aedh ‘Buidhe’ O’Neill+2 d. 2 May 1444
- Muircheartach ‘Ruadh’ O’Neill+2 d. c 1471
- Niall ‘Gallda’ O’Neill2
Henry ‘Caech’ O’Neill1 
He was ancestor of the Silocht Henry Caech.1 In 1426 he was blinded by his brothers.1
Aedh ‘Buidhe’ O’Neill1 
Eoghan, ancestor of Silocht Eoghain in Clannaboy.1 He held the position of Chief of Clannaboy from in 1426.1
Children of Aedh ‘Buidhe’ O’Neill and Fionnguala O’Connor
- Conn O’Neill+2 d. 1482
- Aedh ‘Og’ O’Neill1 d. 1485
- Eoghan O’Neill1
- Brian O’Neill1 d. 1488
Muircheartach ‘Ruadh’ O’Neill1 
He was ancestor of the sept called Sliocht McINeill.1 He held the position of Chief of Clannaboy from in 1444.1 He had 11 other sons.1
Child of Muircheartach ‘Ruadh’ O’Neill
- Feidhlimidh O’Neill1 d. 1497
Niall ‘Gallda’ O’Neill1
He was ancestor of the O’Neills of Killultagh.1
Fionnguala O’Connor1 
Children of Fionnguala O’Connor and Aedh ‘Buidhe’ O’Neill
- Conn O’Neill+2 d. 1482
- Aedh ‘Og’ O’Neill1 d. 1485
- Eoghan O’Neill1
- Brian O’Neill1 d. 1488