The Clan Conchobair were originally Kings of Magh Ith in Tirconnell, that territory now mostly comprised by the Barony of Raphoe, but also extending into Tyrone in earlier times. According to O'Donovan (Ordnance Survey Letters) the lands of Magh Ith were the mensal lands of the Kings of Aileach (MacLaughlin and Ó Neill). The Clan Conor Kings of Magh Ith were at an early date replaced by the line of the Cenel Moain of Cenel Enda (the O'Gormleys and their kinsmen), who were in turn driven from Magh Ith into nearby Derry county by the O'Donnells. At about the same time the O Cathains of Clan Conor were recognised by the annalists as Chiefs of the Cianacht of Glean Geibhin and the Creeve, now the barony of Coleraine in Derry County; and their kinsmen the O Carrollans held the territory of Clandermod in the same county.
Niall 'of the Nine Hostages' | Eoghain (a quo Clann Owen) | Muirdaigh | Muirchertagh | Domnall ilcealcaigh | Aedh Uairiodhnaigh | Maile Fithrigh | Maile duin | Fergail |__________________________________________ | | Conor (a quo Clann Conor - had ten sons) Nial Frasach 'of the showers' |__________________ | | (McLaughlin and Ó Neill) Drugain Diermada | | Cathain Baighill (a quo O Cathain) | Cairellain (a quo O Carolan)