Clann Carthaig - Heberian Eoghanacht Sept who in 1471 AD were the Mac Carthys who had their territory at Desmond in Co. Kerry in the south - west of the Munster Province. Descended from 107.Carthy - Carthach - the Loving One.

Caruidhe Cuile Cearnadha Sept - Auliffe - Amhlaibh O Rothlain was the Chief of in 1208 AD.

Siol Cathail - A Heremonian Dal Cuinn Ui Briuin Ai Siol Muiredaig Sept, descended directly from 98.Cathal the 23rd King of Connacht, who was one of the 2 sons of 97.Murray - Muiredach the 18th King of Connacht and direct ancestor of the Siol Muiredaig Septs in Connacht.

Ui Chathbad Chuille - A Heberian Eoghanacht Sept descended directly from 89.Cathub, one of 3 sons of 88.Luigthech, a brother to 89.Lewy - Lughaidh the direct ancestor of the Ui Lugdech Eile Sept and to 89.Conall "Corc" the ancestor of the  Eoghanacht Loch Lein Sept, the Eoghanacht Maige Gerginn i nAlbain Sept, the Lemnaig i nAlbain Sept, the Ui Maic Iair Sept, the Ui Maic Brocc Sept, the Eoghanacht Raithlind Sept, the Ui Echach Muman Sept, the Eoghanacht Airthir Chliach Sept and the Eoghanacht Glendamnach Sept.

Clann Cathmail - A Sept who in 1358 AD was represented by the Mac Cowells who had their territory in Co. Tyrone in Central Ulster.

Cauci - Celts who had their territory in Co. Carlow in Southern Leinster with the Brigantes Sept and the Coriundi Sept and also in Co. Kilkenny in the south - west of the Leinster Province with the Brigantes, in Co. Kildare to the east there, and also in Co. Wicklow, who were of Belgic Gaul origins. Also below Eblana in Co. Wicklow in the south - east of Southern Leinster to the north - east of Rheba.

Ui Cearnaigh - Heberian Dal gCais Sept who are descendants of Cearnach a descendent of a son of 91.Cas the King of Thomond and of which the O Ahernes were later Chiefs.

Clann Ceithernaig - A Sept in 1405 AD - see Ciarraige - mheic Ceithernaig,

Clann Cellaig - A Sept who in 1300 AD was represented by the Clan Kelly of Co. Fermanagh - Orairt who had their territory in the south - west of the Ulster Province.

Clann Cellaig -  Heremonian Dal Cuinn Ui Maine Sept who in 1316 AD was represented by the O Kellys who had their territory in Eastern Connacht.

Siol Ceallaig Sept - Descended directly from 96.Kelly - Ceallach mac Ragallaig the Ui Briuin Ai 19th King of Connacht who had his territory at Loch Hacket near Headford in the far - west of Magh nAi in Northern Connacht. He was one of the sons of 95.Reilly - Ragallach mac Uatach the direct ancestor of the Ui Briuin Ai Sept who had been the previous 12th King of Connacht. 96.Kelly - Ceallach was of a very great age as his father had been the previous King for 27 years and he had retired to the church but his Ui Briuin Ai Siol Ceallaig Sept were to continue to contest the Kingship of Connacht with that of his brothers from the Siol Muiredaig Sept and the Siol Cathail Sept during the 8th Century AD. Eventually the Ui Briuin Ai Sil Ceallaig Sept  were to be driven out of their Headford territory by another of the Ui Briuin Septs the Ui Briuin Seola descended from 89.Senach, a brother to their direct ancestor 89.Eogan "Srem" who were both sons of 89.Daui "Tenga Uma" - of the Sweet Tongue the Ui Briuin 3rd King of Connacht, the son of 87.Brion.

Clann Ceoch - A Sept who in 1350 AD  had their territory in the north - west of Co. Tipperary in Northern Munster.

Cenel Cerdraige - Heberian Sept descended from 85.Tighernach one of the 4 sons of 84.Ailill "Oluimm" the 1^st King of Munster and 81.Sadbh the daughter of 80.Conn of the Hundred Battles the Heremonian 110^th King of Tara - Ireland. He was a brother to 85.Eoghan "Mor" the direct ancestor of the Eoghanacht Septs, 85.Cormac "Cass" the direct ancestor of the Dal gCais Septs and 85.Cian the direct ancestor of the Cianachta Septs.

Ui Chairin - Heberian Dal gCais Sept who had their territory in Kernin in the north - east Co. Tipperary in the north - east of the Munster Province - O Meachair - O Meagher - Maher - Chiefs in 1413 AD who were kinsmen to the O Carrols of Ely.

Ui Chairpri - Heberian Eoghanacht Chaisil Sept who had their territory in the west of Carberry in Co. Cork in Southern Munster - Kings and Chiefs of - see Mag Carthaig "Riabach."

Chaisil - A Heberian Eoghanacht Chaisil Sept descended directly from 89.Conall "Corc" the Chaisil 1st King of Cashel - Munster, his son, 90.Nad "Froich" the Chaisil 2nd King of Cashel - Munster, 91.Angus - Oengus the 3rd King of Cashel - Munster and then through 2 of his 3 sons 92.Felim - Feidlimid the Chaisil 4a King of Cashel - Munster who was to produce 26 Kings and 92.Bressall who was to produce only 1 King.

Clan Chathail - Heremonian Dal Cuinn Ui Briuin Ai Siol Muiredaig Sept who in 1275 AD was represented by the O Flanagans who had their territory around Elphin in Co. Roscommon in Eastern Connacht.

Ui Chathbad Chuille - An Eoghanacht Sept were not descended from 89.Conal "Corc" but were descended from his brother, 89.Cathbad - Cathub through his son, 90.Ailill who had been baptised by St. Patrick at Ochtar Cuillend in Ui Chuanach - Cullen on the Co. Limerick, Co. Tipperary border who was at that time the Chathbad Chuille King.  89.Cathub was one of the 3 sons of 88.Luigthech, one of the 3 sons of 87.Ailill "Fland Bec." They were later to be replaced by the Eoghanacht Airthir Chliach

Ui Cheinnselaig - Heremonian Sept descended from 94.Enna - Enda "Cennsalach" the Cu Corb 2nd King of Leinster who was one of the 3 sons of 93.Labraid "Laidech," one of the 2 sons of 92.Bressal "Belach" the Cu Corb 1st King of Leinster, a son of 91.Fiachu "Ba hAiccid" who was one of the 9 sons of 90.Cahir - Cathair "Mor" the 109th King of Tara - Ireland descended from 86.Cu "Corb" the direct ancestor of all the Cu Corb Septs in the Leinster Province. Represented today by the Families of Mac Murrough, Kavanaghs and Kinsellas. Their territory was in the south - east of Southern Leinster.

Ui Cheithig Sept  - Territory was in the north - east near Cloncurry in Southern Leinster with the Ui Gabla Sept further to the east and Ui Faelain Sept below.

Ui Chellaig Cualann - A Heremonian Cu Corb Sept descended directly from 101.Kelly - Ceallach "Cualann" the 13th King of Leinster descended from 97.Aed "Dibchine" the 6d King of Leinster and 90.Maine "Mal" the direct ancestor of the Ui Mail Sept & Ui Theig Sept who was a brother to 90.Cahir - Cathair "Mor" the 109th King of Tara - Ireland who were both sons of 89.Felim - Feidlimid "Fer Aurglas," a grandson of 87.Nia "Corb" one of the 4 sons of 86.Cu "Corb" the direct ancestor of all the Cu Corb Leinster Septs. They were to produce 4 Kings of Leinster. Their territory was further inland below Dublin and west of the Cu Corb Ui Briuin Chualann Sept along the east - coast of the north - east of the Leinster Province.

Ui Chellaig Leige - An O Kelly Sept who had their territory in the north - east of Co. Laois in the mid - west of the Leinster Province.

Fir Chera - A Heremonian Dal Cuinn Northern Ui Fiachrach Sept descended directly from 88.Macc Ercae, one of the 3 sons of 87.Fiachra the direct descendant of the Ui Fiachrach Septs who was one of the 5 sons of 86.Eochy - Echu "Mugmedon" the 124th King of Tara - Ireland. They had their territory at Castlebar in Co. Mayo in the mid - west of the Connacht Province to the south - east of the Ui Briuin Umaill Sept and below their Northern kinsmen the Ui Fiachrach Muaide Sept.

Ui Chinaetha - A Sept who had their territory in Siol nAnmchada in the Barony of Longford in Co. Galway in the south - west of the Connacht Province and the parish of Lusmagh in Co. Offaly in the north - west of the Leinster Province.

Ui an Chlaich - Clann an Chlaich - A Clan Kee Sept  who in 1377 AD had their territory in Co. Cavan in Southern Ulster.

Fir Chraibe Sept - had their territory on the western side of the River Bann with the Fir Li Sept.

Clann Chualachta - Heberian Dal gCais Sept descended from 92.Angus - Oenghus "Ceannathrach" one of the 12 sons of 91.Cas the King of Thomond through his descendant, Cuallachta - Collachtach, who had their territory around the Barony of Inchiquin in Co. Clare in the north - west of the Munster Province of which the O gRiobta was the main Sept and the O Deas their main Family.

Clann Chuileainn - Culien - Heberian Dal gCais Sept descended from 92.Caisin the second son of 91.Cas the King of Thomond - North Munster through his descendant, Cuilean the direct ancestor of the Mac Namaras. 1320 AD represented by the Mac Namaras of central and south - east Co. Clare in the north - west of the Munster Province.

Ui Choirpri Aebda - A Heberian Eoghanacht Ui Fidgeinti Sept descended directly from 91.Coirpre, one of the 2 sons of 90.Brion, the son of 89.Fiachu - "Fidgennid" the direct ancestor of the Ui Fidgeinti Sept, a son of 88.Maine "Munchain" one of the 3 sons of 87.Ailill "Fland Bec," a son of 86.Fiachu "Mullethan," the son of 85.Eoghan "Mor."

Clann Cholmain - A Heremonian Dal Cuinn Southern Ui Niaill Sept descended directly from 91.Colman "Mor," one of the 3 sons of 90.Diarmait mac Carroll the 133rd King of Tara - Ireland, a son of 89.Fergus "Cerball," one of the 2 sons of 88.Conall "Cremthainne," one of the 8 sons of 87.Niall of the Nine Hostages the 126th High King of Tara - Ireland. Had their territory in central Mide - Meath to the south - west of their kinsmen the Heremonian Dal Cuinn Southern Ui Niaill Cenel Ardgail & Cenel Loegaire Sept, near Mullingar, Uisnech and Loch Ennell with the Cu Corb Ui Cheinnselaig Fir Thulach Mide Sept below along with the Cu Corb Crich na Cetach Sept.

Ui Chonaill Gabra - A Heremonian Eoghanacht Ui Fidgeinti Sept descended directly from 93.Conall, a son of 92.Inrat, a son of 91.Daire, one of the 2 sons of 90.Brion, the son of 89.Fiachu - "Fidgennid" the direct ancestor of the Ui Fidgeinti Sept, a son of 88.Maine "Munchain" one of the 3 sons of 87.Ailill "Fland Bec," a son of 86.Fiachu "Mullethan," the son of 85.Eoghan "Mor."

Fir Chul Breg - A Heremonian Dal Cuinn Southern Ui Niaill Siol nAedo Slaine Sept descended directly from 92.Ailill the 4th King of Brega, who is also the direct ancestor of the Siol Dluthaigh Sept who was one of the 5 sons of 91.Aed "Slaine the 139th joint King of Tara - Ireland. one of the 3 sons of 90.Diarmait mac Carroll the 133rd King of Tara - Ireland, a son of 89.Fergus "Cerball"  one of the 2 sons of 88.Conall "Cremthainne," one of the 8 sons of 87.Niall of the Nine Hostages the 126th High King of Tara - Ireland. 695 AD 94.Aedh the Fir Chul King was a son of 93.Dluthach, the son of 92.Ailill the direct ancestor of the Sil nAedo Slaine Fir - Feara Chul Breg Sept. Their territory was near Kells and below the Gailenga Sept with the Ui Macc Uais Breg below them to the east on the River Blackwater in north - east Mide - Northern Leinster.

Cianacht Sept - Heberian Cianacht descended from 85.Cian, a son of 84.Ailill "Oluimm" the 1st King of Munster who had their territory at Keenaught in the central north - east of the Ulster Province to the west of the Heremonian Dal Riada Sept and below the Northern Ui Niaill Cenel nEogain Sept and above Dungiven and to the east of Derry.

Fir Arda Cianachta - A Heberian Cianachta Sept - Territory situated along the east coast below the 3 Colla Fir Rois Sept in Southern Ulster and north of the River Boyne. 686 AD Dubhdainbher was their King.

Cianachta Breg - A Heberian Cianachta Sept who had their territory below the River Boyne on the east coast with the Saithne Sept well below them and the Southern Ui Niaill Siol nAedo Slaine Sept to the west in north - east Mide - Northern Leinster. Descended from 85.Cian.

Cianachta Glinne Geimhin Sept - A Heberian Cianachta Sept who had their territory in the north of the Ulster Province below the Cenel nEogain Sept. Descended from 85,Cian.

Cianachta Eile were in the north near Birr in Co. Offaly in the mid - west of Southern Leinster. Descended from 85.Cian.

Cianachta Luigni who had their territory inland in the Connacht Province and in the north - east of the Leinster Province. Descended from 85.Cian.

Cianachta Corca Mruad who had their territory in the north - west near the coast in Co. Clare in the north - west of the Munster Province. Descended from 85.Cian.

Ciarraige - Black People - A Sept who were in the north - west of Co. Roscommon in Eastern Connacht who were the ancient Chiefs of Airtech, whose territory took in the Barony of Frenchpark with their main seat at Baslic near Castlerea. North River Suck.

Ciarraige - had their territory in the north - west of Co. Kerry in the south - west of Southern Munster - Iarmumu below the River Shannon mouth with the Altraige Sept who they had subsumed.

Ciarraige Ai - A Sept who had their territory below Baslick in the Ui Briuin Ai territory in Northern Connacht and below the Ciarraige Airtig Sept and to the west of Magh nAi with the Ciarraige Airne Sept to the west.

Ciarraige Airne Sept - In the 9th Century AD their territory was to the west of Baslick and Cruachu, south - west of the Ciarraige Airtig Sept and to the west of the Ciarraige Ai Sept in the territory of the Heremonian Dal Cuinn Ui Briuin Ai Sept and west of Mayo.   

Ciarraige Airtig - A Sept who had their territory at West Loch Gara to the west of the Heremonian Dal Cuinn Ui Briuin Sinna Sept and east of the the Mag nAirtig and north of the Ciarraige Airne Sept situated in between the territories of the Heremonian Dal Cuinn Ui Briuin Ai Sept & Heremonian Dal Cuinn Ui Ailello Sept.

Cirraige Cuirche Sept - had their territory below Cork and the River Lee in Co. Cork in Southern Munster above the Eoghanacht Raithlind Cenel nAeda Sept.

Ciarraige Luachra - A Sept who had their territory in Mulloe in the west of Co. Limerick in the mid - west of the Munster Province who were later to come under the over lordship of the Heberian Eoghanacht Ui Fidgeinti - Corco Ochae.

Cirraige - were in the west above Tralee in Co. Kerry in the south - west of the Munster Province.

Ui Coirpre Aebda Ui Fidgeinti Sept - their direct ancestor was 91.Coirpre one of the two sons of 90.Brion the son of 89.Fiachu "Fidgennid" the direct ancestor of the Eoghanacht Ui Fidgeinti Sept and Ui Chonaill Gabhra Septs.

3 Collas - Heremonian  Dal Cuinn - Colla Da Crioch - Fiachrach "Casan" male line -  84.Eochy - Eochaidh "Doimhlen" was the father of the 3 Colla brothers the Kings of Orghialla - Airghialla - Oriel. 85.Murray - Muiredach "Colla Da Chrioch" - of the Two Countries - Erinn & Alba - Scotland. 85.Carroll - Carioll "Colla Uais" - The Noble the 121^st King of Tara - Ireland. Meann -"Colla Meann" - the Famous. Their mother was Alechia the daughter of the King of Alba - Scotland. The 3 Colla brothers and their descendants ruled Orghialla - Airghialla - Oriel until the 12^th Century AD when they came under the over lordship of their kinsmen the Heremonian Dal Cuinn Northern Ui Niaill. 9th Century AD - Orghialla - Airghialla - Oriel was to be confined to Co. Fermanagh, Co. Armagh & Co. Monaghan in Southern Ulster, and part of the adjoining Co. Louth in the north - east of the Leinster Province.

Cenel Conaill - A Heberian Eoghanacht Chaisil Sept descended directly from 99.Conall, a son of 98.Snedgus, one of the 2 sons of 97.Nad "Fraich," a son of 96.Colgan - Colgu the Chaisil 15th King of Cashel - Munster, one of the 2 sons of 95.Failbe "Fland" the Chaisil 11th King of Cashel - Munster a descendant of 92.Felim - Feidlimid the Chaisil 4a King of Cashel - Munster.

Cenel Conaill - A Heremonian Dal Cuinn Northern Ui Niaill Sept descended directly from 88.Conall "Gulban" one of the 8 sons of 87.Niall of the Nine Hostages the 126th High King of Tara - Ireland. They were to be predominant until 734 AD and their territory was in the far - west of Co. Donegal adjoining the territory of both their kinsmen the Cenel nEndae and the Cenel nEogain. 9th Century AD - their territory was cut off in Co. Donegal in Tir Conaill - The Land of Conall - in the west of the Ulster Province with their only chance of expansion being south into Northern Connacht.

Ui Conaing Sept - their direct ancestor was 92.Congal the Southern Ui Niaill Sil nAedo Slaine 3rd King of Brega one of the 5 sons of 91.Aed "Slaine" the Northern Ui Niall Joint 139th King of Ireland.

Conaille Muirthemne - A Heremonian Dal Cuinn 3 Colla Sept on the south - east coast of the Ulster Province below the Irian Ui Echach Cobo Sept and above Louth in the north - east of the Leinster Province with the Heremonian Dal Cuinn 3 Colla Mugdorna Maigen Sept to the west and the 3 Colla Airthir Sept to the north - west and Monaig Sept. 686 AD Uaircridhe O Oisene was their King. 747 AD Foidmeann was their King, who was a son of Fallach.

Conmaicne Cuile Sept who were a subject Clann of the Southern Dal Cuinn Ui Fiachrach Sept.

Conmaicne Cuile Tolad - A Sept who had their territory to the east of Loch Mask below Mayo in the north and Cong in the south in Co. Mayo in the south - west of the Connacht Province with the Partraige Sept to the west below Loch Mask.

Conmaicne Mara - A Sept who had their territory at the Connemara in Western Connacht near Clifden on the south - west coast east of the Partraige Sept who were between Loch Mask and Loch Corrib with the Delbna Tire da Locha to the South - east.

Conmaicne Rein - A Sept who had their territory in the south - east of Co. Leitrim in Northern Connacht at Carrick on Shannon centred on the Barony of Mohill and also included parts of the Barony of Leitrim and Carrigallen and a part of the north of Co. Longford in the north - west of the Leinster Province below the territory of the Ui Briuin Breifne Sept where they were to be absorbed along with other Septs during the 8^th Century AD by the O Rourkes - Ui Ruairc, and O Reilly - Ui Ragallaig East Breifne Septs.