The O'Boyle () family of County Donegal were a clan of the Northern UàNéill, a great tribal dynasty of the North Gaels descended from Niall of the Nine Hostages. The O'Boyles were one of the principal families of the Cenél Conaill within the Northern UàNéill and originally Chiefs of the Three Tuaths in the northwest of TÃÂr Chonaill (County Donegal). When these lands passed to The MacSweeneys (Mac Suibhne), the O'Boyle became chiefs of TÃÂr Ainmhireach, later to be known as CrÃÂoch Bhaoigheallach, or O'Boyles country, now the Barony of Boylagh.
This timeline traces the O'Boyle clan back to ÃÂgaine Mór.
Ugainy Mór (ÃÂgaine Mór) King 499-459 BC (Foster-son of Prince Eochaidh Buadhach & Macha Mong Ruad) æ æ æ Laeghaire Lorc Colethach Caol-bhreagh (Cobhtach Caol mBreagh) King 459-457 BC King 457-407 BC æ æ Oilill Aire Melg Molbhtach King 388-371 BC (Labhradh Loingseach) æ Iaran Gleofathach æ Conla Caomh King 328-308 BC æ Olioll Cas-fiachlach (Olliol III Caisfhiaclach) King 308-283 BC æ Eochaidh Alt-Leathan æ Aongus Tuirmeach-Teamrach æ æ Enna Aigneach Fiacha Firmara (ÃÂanna III Aigneach) (Dalriada and King 206-186 BC Argyle kings) æ æ Prince Assaman Eamha Prince Labhra Laire æ æ Prince Roighen Ruadh Prince Blathach æ Prince Fionnlogh æ Prince Fionn æ Eochaidh Feidlioch (Eochaidh X Feidhliach) King 23-8 BC æ Prince Bress-Nar-Lothar (Fineamhas) æ Lughaidh Sriabh-nDearg (Lughaidh V) King 63âÂÂ71 æ Crimthann-Niadh-Nar (Criomthann II) King 72âÂÂ88 æ Feredach Fionn Feachthach (Fearadhach Finnfeachtnach) King 93âÂÂ115 æ Fiacha Fionn Ola (Fiatach Fionn) King 115âÂÂ118 æ Tuathal Teachtmar (Tuathal I Teachtmhar) King 129âÂÂ159 æ Fedhlimidh Rachtmar (Feidhlimidh Reachtmhar) King 163âÂÂ173 æ Conn of the Hundred Battles (Conn Céad Cathach/Conn Cetchatach) King 176âÂÂ211 | | Art Mac Cuinn (Art II Aoinfhear) King 219âÂÂ249 | | Cormac MacArt (Cormac Ulfhada Mac Airt) King 254âÂÂ277 | | | St. Colum (St. Columba) Born 521 | Cairbre Lifechair (Cairbre II Lifiochair) King 279âÂÂ296 æ æ Fiacha Sraibhtine (Fiachadh V) King 297âÂÂ327 æ æ Muiredach Tirech (Muireadhach II) King 331âÂÂ357 æ æ Eochaid Mugmedon (Eochaidh XII) King 358âÂÂ366 æ æ Niall of the Nine Hostages (Niall I NoigÃÂallach/Naoighiallach) King 379âÂÂ405 | | Conall Gulban (Son of Niall of the Nine Hostages) | | Ui Neill (Hy Niall) | | | | Northern UàNéill Southern UàNéill | | Maoldun Baoghal (Heremon King) Clan Conaill (Cineal Conaill) | | | | | | Aneisleis àBaoighill (Donegal Chieftain) Domhnall (Dohmnall IV Ard Mhacha àNéil) | Born 943, King 956âÂÂ980 | O Boyle Clan