Donnchad mac Cellacháin (

fl. ''Floruit'' ( ; usually abbreviated fl. or occasionally flor.; from Latin for 'flourished') denotes a date or period during which a person was known to have been alive or active. In English, the unabbreviated word may also be used as a noun indic ...

961–963) was a son of Cellachan of Cashel who is alleged to have briefly ruled as King of Cashel and

Munster Munster ( or ) is the largest of the four provinces of Ireland, located in the south west of the island. In early Ireland, the Kingdom of Munster was one of the kingdoms of Gaelic Ireland ruled by a "king of over-kings" (). Following the Nor ...

from 961 until 963, when he was murdered by his brother. Although in some popular accounts he is succeeded immediately by Mathgamain mac Cennétig of the Dál gCais, 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 of the Eóganacht Raithlind 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