Duinseach ingen Duach

Duinseach ingen Duach, Queen of Tara, fl. 500.
Background.
Duinseach was a daughter of Dauí Tenga Uma, King of the Connachta. She was married to King Muirchertach mac Muiredaig (died 532), King of Tara. They were ancestors of the Cenél nEógain.
Battle of Seaghais.
Duinseach is said to have been responsible for the battle of Seaghais in 500, where her husband killed her father.
Annalistic account of Seaghais.
An account of the battle is given "sub anno" 499 (sic 500) in the Annals of the Four Masters:
"The battle of Seaghais was fought by Muircheartach mac Earca against Duach Teangumha, King of Connaught. The cause of the battle was this, viz.: Muircheartach was a guarantee between the King and Eochaidh Tirmcharna, his brother, and Eochaidh was taken prisoner against the protection of Muircheartach. In proof of which Ceannfaeladh said:"
"Against the Connaughtmen these battles were gained."
Family tree.
 Eochaid Mugmedon
 |_______________________________________________
 | |
 Brión Niall Noígíallach
 | |
 Dauí Tenga Uma Eógan mac Néill
 | |
 |________________ Muiredach mac Eógain
 | | |
 Cú Charainn Duinseach, alive 500 = Muirchertach mac Muiredaig/Muirchertach mac Ercae
 | ________________|____________________
 Mugain ingen Cú Charainn | |
 =Diarmait mac Cerbaill | |
 | Forggus mac Muirchertaig Domnall Ilchelgach, died c. 566.
 Áed Sláine
Cenél nEógain descendants.
 Domnall Ilchelgach, died c. 566.
 |______________________________________
 | | |
 Áed Uaridnach Eochaid Colgo
 |_______________________________________
 | |
 Máel Fithrich mac Áedo, d. 630. Dáre
 |_____________________________________________
 | |
 Máel Dúin mac Máele Fithrich, died 681. Máel Tuile (ancestor of Síl Maíle Fithrich)
 |
 Fergal mac Máele Dúin
 |_____________________________________________________
 | | | |
 Áed Allán Niall Frossach Conchobar Colgu (ancestor of Clann Colgan)
 | _________|_________________________________________________________
 | | | | |
 | Áed Oirdnide Colmán Ferchar Muirchertach
 | | (Clann Colmáin) (Muinter Dúin Bó) (a quo Clann Muirchertaich Locha Enaich)
 | |____________________________________________________________________________________
 | | | | | |
 | Niall Caille (died 846) Máel Dúin Fogartach Blaithmac Máel Calland
 | (issue) (Síl Máela Dúin) (issue) (Úi Duib Enaich)
 |__________________________________________
 | |
 Máel Dúin mac Áedo Alláin Cathal (ancestor of Clann Cathail)
 |___________________________________________________________________
 | | |
 Murchad mac Máele Dúin, fl. 819–833. Tigernach Flann
 | Úi Tigernaich Úi Chellaich & Úi h-Uidir.
 |__________________________________________________________________
 | | |
 Erulb/Herulfr Ruadrí Muiredach
 |________________________ |_______________ |
 | | | | Úi Flaithbertaich
 Amlaíb Sartobda Birn Máel Ciaráin
 | | | |
 Niall, d.958/964? Tomrar Muintir Birn Úi Domnalláin
 | |
 Áed Gilla Maire
 | |
 Donnchad Tomrar
 d.1014. d. 1013?
 |
 Máel Colum
Muintir Birn/Byrne of Donegal.
 Birn mac Ruadrí mec Murchad mac Máele Dúin
 |___________________________________________________________
 | | |
 Anféid Cern Guthmár Donnacán
 | | |
 Tellach n-Anfida Tellach Cruind id est Úi Fergail Tellach n-Donnacáin