Niall Glúndub, High King of Ireland

Niall Glúndub mac Áeda was a 10th-century Irish king of the Cenél nEógain and High King of Ireland. Many Irish kin groups were members of the Uí Néill and traced their descent from Niall of the Nine Hostages.

High King of Ireland was a royal title in Gaelic Ireland held by those who had, or who are claimed to have had, lordship over all of Ireland. The title was held by historical kings and was later sometimes assigned anachronously or to legendary figures.