Cellach Ó Cellaigh
Cellach Ó Cellaigh was a 16th‑century Irish chieftain from Aughrim, County Galway. He led his branch of the Ó Cellaigh (O’Kelly) clan in Ui Maine. He was the great‑great‑grandson of Conchobar Maenmaige Ua Cellaigh, who had been king in 1180.
His father was Domnall mac Aodh Ó Cellaigh, whose wife was Catherine Burke, daughter of Ulick Finn of Clanricarde. Cellach’s great‑grandfather, William mac Melaghlin Ó Cellaigh, was the first in the family to be associated with Aughrim.
Cellach married Julia Ní Cellaigh, daughter of Tadg Dubh of Gallagh, and they had two sons: Feardorcha and Hugh. Feardorcha Ó Cellaigh became the 79th and last king of Ui Maine and the 43rd Chief of the Name. His descendants include the Counts and Countesses O’Kelly de Grallagh.
A 1934 article gives Cellach’s pedigree as: Cellach mac Domnall m. Aodh m. William m. Melaghlin m. William Buidhe m. Donoch Muimbreach m. Conchobhair m. Domnall m. Teige Tailtenn m. Conchobar Maenmaige.
References include The Tribes and Customs of Hy‑Many by John O’Donovan (1843), The Parish of Ballinasloe by Jerome A. Fahey, and Notes on the O’Kelly Family by E. Festus Kelly (Galway Archaeological and Historical Society, 1934–35).
This page was last edited on 29 January 2026, at 07:59 (CET).