| Parent house | Connachta (Uí Briúin Ai) becoming Mac Diarmada |
|---|---|
| Country | Kingdom of Connacht |
| Founded | 1315 |
| Founder | Donnchadh Mac Diarmada |
McDonagh, also commonly spelled MacDonagh, is a surname of Irish origin. It derives from the Irish Gaelic Mac Dhonnchadha, literally translating to "Son of the brown warrior".
Earlier and original variants include Mac Dhonnchadha, Mac Donnchadha, Mac Donnacha, Mac Donnchaidh and Mac Donnacha.
| Male | Daughter | Wife (Long) | Wife (Short) |
|---|---|---|---|
| Mac Donnchadha | Nic Dhonnchadha | Bean Mhic Dhonnchadha | Mhic Dhonnchadha |
Tomaltach na Cairge mac Diarmata (Tomaltach of the rock) was the King of Moylurg from 1197 until his death in 1207. One of Tomaltach's sons, Donnchadh, was the progenitor of the MacDonagh sept. The family later became Kings or Lords of the túath of Tír Olliol and Corran now the barony of Tirreril in Co. Sligo.
The first to be known as Mac Donnchadha was Tomaltach Mac Donnchadh, Donnchadh MacDermot's grandson, alive in 1309. Tomaltach Mac Donnchadh and his men fought with Aedh Breifneeh O'Conchobhair (Hugh the Breifnian) defeating in battle Aedh Ó Conchobair, King of Connacht for control of the Three Tuathas.
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