Darnii / Darini Celts who had their territory in Co. Antrim and Co. Derry in the north - east of the Ulster Province.

Dartraige - Eastern. A Sept - who had their territory near Enniskillen in Co. Fermanagh in the south - west of the Ulster Province near Newtown Butler.

Dartraige - Western. A Sept who had their territory in the south - west of the Ulster Province.

Deagades. A Heremonian Ui Cobhthaigh Ui Conaire Muscraige Sept of the Earnans who had their territory in the Munster Province. Ancestors - *69.Conaire 11 the 111th King of Tara / Ireland - *37.Heremon.

Deisi / Decies / Deise. A Heremonian Ui Cobhthaigh Sept / Family branch - descended from *81.Angus / Oengus "Gaibuaibthech" / of the Poisonous Spear who in 265 AD was involved in a dispute with his kinsmen 82.Cormac mac Airt the 115th Heremonian Ui Cobhthaigh Dal Cuinn 115th King of Tara / Ireland at Tara in Mide / Meath in Northern Leinster killing 82.Cormac's son, 83.Kelly / Cellach and blinding 82.Cormac in one eye so that he had to eventually withdraw from Tara as the King due to the blemish. *81.Angus "Gaibuaibthech" was a son of *80.Fiacha "Suighdhe,” another son of *79.Felim "Reachtmar" / The Lawgiver the 108th King of Tara / Ireland who was the father also of 80.Conn of the Hundred Battles the 110th King of Tara / Ireland the direct ancestor of the Dal Cuinn Septs. They had their original territory in Brega to the south - west of Tara in Co. Meath in the south - east of Northern Leinster. After 7 more battles they were then driven from Mide / Meath by 82.Cormac mac Airt and settled in the Dungarvon region in Co. Waterford in the south - east of the Munster Province, which became Deisi Mumhan between the River Blackwater and the River Suir in the region still known as "The Decies" above Ardmore with Lismore to the south - west on the River Blackwater. In 746 AD Muirgius was their King, who was a son of Fergus / Fearghus. Deisi Temro - They also later conquered the territory in the south of Ossory in Co. Kilkenny in the south - west of Southern Leinster assisted by the Ithian Corca Loigde Septs. Ancestors - *81,Angus / Oenghus "Gaibuaibthech" -*78.Toole / Tuathal "Teachtmhar" the 106th King of Tara / Ireland -*79. Felim "Reachtmar" the 108th King of Tara / Ireland - 37.Heremon.

Tuatha De Danann. A Scythian Nemedian Celtic Sept / Family branch - descended from *Nemedh and *13.Fathnachta one of the 3 sons of *12.Magog. They gained control in Ireland over their kinsmen the Nemedian Fir Bolg Septs who were also descended from *Nemedh who were by then infused also with Teutonic blood. They lost control of Ireland in the 16th Century BC to the Scythian Gaelic Milesian Septs.

Ui Dego. A Heremonian Ui Laoghaire Cu Corb Sept / Family branch - directly descended from *94.Daig, 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" / The Lame 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. Their territory was inland from the east coast below their kinsmen the Cu Corb Ui Enechglais Sept near Arklow and above their other kinsmen, the Cu Corb Ui Cheinnselaig Sept at Ferns and to the north - west of Arklow. Ancestors -  *93.Daig *86.Cu "Corb" - *60.Leary / Laoghaire - *37.Heremon.

Delbna - of Iar (West) in Co. Galway in the south - west of the  Connacht Province.

Delbna Bethra - Territory situated below Clonmacnoise in Co. Offaly in the mid - north - west of Southern Leinster, in the region of the Heremonian Ui Cobhthaigh Dal Cuinn "Southern" Ui Niaill Cenel Fiachach whose territory crossed over the River Brosna to Durrow in the east. 

Delbna - East. Territory further to the east near Co. Roscommon in the east of the Connacht Province.

Delbna Mor. A Sept / Family branch - who had their territory above the Fir Bile Sept but below the Heremonian Ui Cobhthaigh Dal Cuinn "Southern" Ui Niaill Caille Follamain Sept in Central Mide / Meath / Northern Leinster with their kinsmen the Heremonian Ui Cobhthaigh Dal Cuinn "Southern" Ui Niaill Cenel nArdgail Sept to the south - east and the Heremonian Ui Cobhthaigh Dal Cuinn "Southern" Ui Niaill Cenel Loegaire Sept to the east.

Delbna Nuadat. Territory to the west of Loch Ree between the River Shannon and the River Suck below Roscommon with Athlone to the south - east.

Delbna Tire da Locha. A Sept / Family branch - who had their territory in the far - south - west region of Loch Corrib below the Irian Conmaicne Mara Sept  and the Partraige Sept in Co. Galway in  Southern Connacht.

Clann Domnaill na Dalaigh. A Heremonian Ui Cobhthaigh Dal Cuinn "Northern" Ui Niall Cenel nEogain Sept / Family branch - who had their territory in Co. Tyrone in Central Southern Ulster. Main Family: O Donnelly / Ua Donghaile. Ancestors - *100.Donnelly / Donghallach - *99.Aed "Findliath" the 163rd King of Tara / Ireland - *98.Niall "Caille" the 161st King of Tara / Ireland - *97.Aed "Oirdnide" - *96.Niall "Frossach" the 158th King of Tara / Ireland - *95.Fergal the 151st King of Tara / Ireland - *91.Donnell / Domhnall "Ilchelgach" the 134th King of Tara / Ireland - *92.Aed "Uaridnach" the 140th King of Tara / Ireland - *90.Murtough / Muirchertach mac Ercae the 131st King of Tara / Ireland - *89.Murray / Muiredach the 2nd King of Aileach - *88.Eogan the 1st King of Aileach - **87.Niall of the Nine Hostages the 126th King of Tara / Ireland.

Ui Drona. A Heremonian Ui Laoghaire Cu Corb Sept / Family branch - who had their territory in the Barony of Idrone in Co. Carlow in Southern Leinster descended directly from *94.Dron, one of the 3 sons of *93.Labraidh "Laidech," one of the 2 sons of *92.Bressal "Belach" the Cu Corb 1st King of Leinster, a son of *91.Fiachu "Ba hAiccid" / The Lame 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 of Leinster Province. Their territory was further inland in mid - western Southern Leinster down near Dinn Righ, below their kinsmen the Cu Corb Ui Buide Sept & the Cu Corb Ui Bairrche Tire Sept and on both sides of the river Barrow with the Fotharta Fea Sept to the east. Ancestors - *94.Dron - *92.Bressal "Belach" the 1st King of Leinster - *90.Cahir / Cathair "Mor" the 109th King of Tara / Ireland - *37.Heremon.

Dal na Druithine. Believed to be a Tuatha De Danann Sept / Family branch - who were subject to the Heremonian Ui Cobhthaigh Dal Cuinn Kings of Connacht.

Ui Duach. A Sept / Family branch -  who had their territory north - east of the River Nore in Southern Leinster.

Ui Duach Argetrois. A Heberian Eoghanacht Sept / Family branch - descended directly from *89.Daui "Cerbba", the son of *88.Daire "Cerbba" or *88.Maine "Munchain" the direct ancestor of the Ui Duach Argetrois & Ui Liathain Septs, which was either an alias or they were twins. They / or he was an uncle / or uncles of 89.Conall "Corc" the 1st King of Cashel / Munster the direct ancestor of all the Chaisil Septs and was one of the 3 sons of *87.Ailill "Fland Bec," the son of *86.Fiachu "Mullethan," the son of *85.Eoghan "Mor" the direct ancestor of all the Eoghanachta Septs. The Ui Liathain Sept were also directly descended from his brother, 89.Eochy / Echu "Liathan." Ancestors - *84.Ailill "Oluimm" the 1st King of Munster - 37.Heber "Fionn."