Donnchad mac Cellacháin ( fl. 961–963) was a son of Cellachan of Cashel who is alleged to have briefly ruled as

King of Cashel The kings of Munster ( ga, Rí Mumhan), ruled from the establishment of Munster during the Irish Iron Age, until the High Middle Ages. According to Gaelic traditional history, laid out in works such as the '' Book of Invasions'', the earliest ...

and

Munster Munster ( gle, an Mhumhain or ) is one of the provinces of Ireland, in the south of Ireland. In early Ireland, the Kingdom of Munster was one of the kingdoms of Gaelic Ireland ruled by a "king of over-kings" ( ga, rí ruirech). Following the ...

from 961 until 963, when he was murdered by his brother. Although in some popular accounts he is succeeded immediately by

Mathgamain mac Cennétig Mathgamain mac Cennétig (also known as Mahon) was King of Munster from around 970 to his death in 976. He was the elder brother of Brian Bóruma. Mathgamain was the son of Cennétig mac Lorcáin of the Dál gCais. His father died in 951 and ...

of the

Dál gCais The Dalcassians ( ga, Dál gCais ) are a Gaelic Irish clan, generally accepted by contemporary scholarship as being a branch of the Déisi Muman, that became very powerful in Ireland during the 10th century. Their genealogies claimed descent fr ...

, the latter was not "full" king of Munster until around the year 970, as admitted in a Dál gCais source, the '' Cogad Gaedel re Gallaib''. It is possible that

Máel Muad mac Brain Máel Muad mac Brain (died 978), commonly anglicised Molloy, was King of Munster, first possibly from 959 Green, p. 362 or alternatively 963 to around 970, when he may have been deposed (usurped) by Mathgamain mac Cennétig of the Dál gCais, and ...

of the

Eóganacht Raithlind Eóganacht Raithlind or Uí Echach Muman are a branch of the Eóganachta, the ruling dynasty of Munster in southwest Ireland during the 5th-10th centuries. They took their name from Raithlinn or Raithleann described around the area of Bandon, in ...

actually claimed the overkingship in Munster as early as 959, Green, Alice Stopford,
History of the Irish State to 1014
'. London: Macmillan. 1925. p. 362 and so if actually king at all Donnchad may only have been titular king of Cashel itself.

References

{{DEFAULTSORT:Donnchad Mac Cellachain Year of birth missing Kings of Munster 963 deaths 10th-century Irish monarchs 10th-century murdered monarchs