Ceili was an Irish

priest A priest is a religious leader authorized to perform the sacred rituals of a religion, especially as a mediatory agent between humans and one or more deity, deities. They also have the authority or power to administer religious rites; in parti ...

in the mid-eleventh century. He was Bishop of Ardagh and died in 1048."Fasti Ecclesiae Hibernicae: The succession of the prelates Volume 3" Cotton, H. p181

Dublin Dublin is the capital and largest city of Republic of Ireland, Ireland. Situated on Dublin Bay at the mouth of the River Liffey, it is in the Provinces of Ireland, province of Leinster, and is bordered on the south by the Dublin Mountains, pa ...

, Hodges & Smith, 1848-1878

References

1048 deaths Bishops of Ardagh {{Ireland-RC-bishop-stub