Conchobar an Abaidh Ó Cellaigh, king of Uí Maine, Chief of the Name, died 1403.

Following a lengthy period of stable rule from c.1349 to 1402 under the kings William Buidhe and his son, Maelsechlainn, Conchobar's reign was the first of two successive short reigns, though it is unclear if succession disputes were the cause of it.

Conchobar was a son of Maelsechlainn, and nickname an Abaidh because he was an abbot at an Ui Maine monastery. The Annals of the Four Masters

Annals of the Four Masters

The Annals of the Kingdom of Ireland or the Annals of the Four Masters are a chronicle of medieval Irish history...

report his death as follows:

Conor Anabaidh, the son of Melaghlin O'Kelly, Lord of Hy-Many, the Serpent of his tribe, and of all the Irish people, died, after Extreme Unction and Penance, and was interred in the monastery of St. John the Baptist in Tir-Many.

Further reading

• The Tribes and customs of Hy-Many, John O'Donovan
  John O'Donovan (scholar)
  John O'Donovan , from Atateemore, in the parish of Kilcolumb, County Kilkenny, and educated at Hunt's Academy, Waterford, was an Irish language scholar from Ireland.-Life:...
  
  , 1843
• The Parish of Ballinasloe, Fr. Jerome A. Fahey
  Jerome A. Fahey
  Father Jerome A. Fahey was an Irish priest and writer, 1843–1919.Fahey was born at Killomoran, Gort, and educated in the town's national school and St. Jarlath's, Tuam. He studied at Maynooth from 1860, been ordained there in 1867....
  
  .
• The Surnames of Ireland, Edward MacLysaght
  Edward MacLysaght
  Edward MacLysaght was one of the foremost genealogists of twentieth century Ireland. His numerous books on Irish surnames built upon the work of Patrick Woulfe's Irish Names and Surnames and made him well known to all those researching their family past.-Early life:Edward was born in Flax Bourton...
  
  , Dublin, 1978.
• A New History of Ireland - lists and genealogies, vol. 9, Oxford University Press, 1984.