Gillacommain mac Niall (died 991) was king of

Uí Díarmata Uí Díarmata was a local kingdom located in what is now north County Galway. Origins The ruling dynasty took its name from King Diarmait Finn of Connacht (died 833), and the territory in turn was named after them. It seems to have been created ...

Background

Gillacommain mac Niall was a member of the SíOl Muiredaig dynasty, who ruled as kings of

The Connachta The Connachta are a group of medieval Irish dynasties who claimed descent from the legendary High King Conn Cétchathach (Conn of the Hundred Battles). The modern western province of Connacht (Irish ''Cúige Chonnacht'', province, literally "f ...

in what is now central

County Roscommon "Steadfast Irish heart" , image_map = Island of Ireland location map Roscommon.svg , subdivision_type = Country , subdivision_name = Ireland , subdivision_type1 = Province , subdivision_name1 = Connacht , subdi ...

. By the mid 10th-century they had expanded south-west into the north-east of

County Galway "Righteousness and Justice" , anthem = () , image_map = Island of Ireland location map Galway.svg , map_caption = Location in Ireland , area_footnotes = , area_total_km2 = ...

. Here a branch of the kindred seized territory and renamed it

, after its founder, Diarmada Finn mac Tomaltaig, who was in turn a great-grandson of King

Indrechtach mac Muiredaig Indrechtach mac Muiredaig Muillethan (died 723) was a King of Connacht from the Uí Briúin branch of the Connachta. He was the son of Muiredach Muillethan mac Fergusso (died 702), a previous king. He was of the Síl Muiredaig sept of the Uí Bri ...

(died 723).

Death and successors

Gillacommain is not known to be attested in the genealogies, nor is there any other reference to him or his father, Niall. He was king in 991 but was at war with

Cú Ceanain mac Tadhg Cú Ceanain mac Tadhg, Prince of Uí Díarmata, ancestor of the Concannon family, died 991 Background Cú Ceanain mac Tadhg was a member of the Síl Muiredaig dynasty, who ruled as kings of The Connachta in what is now central County Roscommon. ...

, a son of his predecessor. The war ended with their mutual deaths, and another unattested member of the Uí Díarmata, Muirgheas mac Aedh, became king. Gillacommain left no known descendants, and after 999, all subsequent Uí Díarmata kings descended from Cú Ceanain mac Tadhg.

References

* ''The Tribes and Customs of Hy-Many'',

John O'Donovan John O'Donovan may refer to: *John O'Donovan (scholar) (1806–1861), Irish language scholar and place-name expert *John O'Donovan (politician) (1908–1982), Irish TD and Senator *John O'Donovan (police commissioner) (1858–1927), New Zealand pol ...

, 1843 * ''The Parish of Ballinasloe'', Fr. Jerome A. Fahey. * https://www.webcitation.org/query?url=http://www.geocities.com/Athens/Aegean/2444/irish/LD.htm&date=2009-10-25+05:47:51 * Vol. 2 (AD 903–1171)
edition
an
translation
* ''Annals of Ulster'' a

a
University College Cork
* ''Annals of Tigernach'' a

a
University College Cork
of McCarthy's synchronisms at

Trinity College Dublin , name_Latin = Collegium Sanctae et Individuae Trinitatis Reginae Elizabethae juxta Dublin , motto = ''Perpetuis futuris temporibus duraturam'' (Latin) , motto_lang = la , motto_English = It will last i ...

. {{DEFAULTSORT:Gillacommain mac Niall Nobility from County Galway 991 deaths 10th-century Irish monarchs Year of birth unknown