Adomnán was born about 624, a relative on his father's side of Columba. He was a member of the Northern Uí Néill lineage Cenél Conaill. He was the son of Rónán mac Tinne by Ronat, a woman from another Northern Uí Néill lineage known as the Cenél nÉnda. Adomnán's birthplace was probably in or near Raphoe, a town in what later became Tír Chonaill (now mainly County Donegal), in Ulster in the north of Ireland. Some of Adomnán's childhood anecdotes seem to confirm at least an upbringing in this fertile eastern part of present-day County Donegal, not far from the modern city of Derry.