Cian mac Máelmuaid

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Cían mac Máelmuaid was a son of Máel Muad mac Brain, who was twice King of Munster. Cían's father had been killed by Brian Boru at the Battle of Belach Lechta. He was a member of Uí Echach Muman or Eóganacht Raithlind,{{citation needed|date=May 2023}} and an "ancestor of the family of O'Mahony".{{citation | authorlink = John O'Donovan (scholar) | editor-last = O'Donovan | editor-first= John | title = Annala Rioghachta Eireann. Annals of the Kingdom of Ireland by the Four Masters | volume = II | place = Dublin | publisher = Royal Irish Academy | edition = 2nd | date = 1856 | page = 772}} [https://archive.org/details/annalsofkingdomo02ocleuoft Volume II]

Cían became a close ally of Brian,{{cite book | authorlink = Alice Stopford Green | last = Green | first = Alice Stopford| url = https://archive.org/details/historyofirishst00gree | title = History of the Irish State to 1014 | place = London | publisher = Macmillan| date = 1925 | pages = 368, 404}} and reputedly married his daughter Sadb, according to later traditions and the antiquarian John O'Mahony.{{cite journal | journal = Journal of the Cork Historical and Archaeological Society | title = A history of the O'Mahony septs of Kinelmeky and Ivagha | series = 2 | volume = 14 | issue = 79 | date = 1908| authorlink = John O'Mahony (antiquarian) | last = O'Mahony | first = J. | url = https://www.corkhist.ie/wp-content/uploads/jfiles/1908/b1908-040.pdf | page = 134 }}{{cite web|url = http://ballineenandenniskean.weebly.com/ | website = ballineenandenniskean.weebly.com|title=The Twin Villages of Ballineen and Enniskean|access-date=12 August 2020 }} Several sources suggest that Cian lived at Enniskean in County Cork,{{cite book | title = West Cork and Its Story | page = 80 | first = Jeremiah | last = O'Mahony | date = 1961 | publisher = Kerryman | quote = One of Cian's residences was at Deargrath (red fort), which gave its name to the townland on which was built the village of Enniskean, called after Cian himself }} and that the village derives its name from him.

He had a son, Mathghamhain mac Cian who died at the Battle of Clontarf in 1014.