Niall Glúndub mac Áeda

Niall Glúndub mac Áedo (Modern Irish: Niall Glúndubh mac Aodha) (died 14 September 919) 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 (Niall Noígiallach).

It was erroneously thought the O'Neill dynasty took its name from Niall Glúndub rather than the earlier Niall, however this has proven to be incorrect. His mother was Máel Muire, daughter of Kenneth MacAlpin, King of Scots.

Son of Aed Finliath, Niall is first recorded succeeding his brother Domnall mac Áedo as King of Ailech upon his death in 911. Extending his control to neighboring kingdoms, Niall defeated the Kings of Dál nAraidi and Ulaid at the Battles of Glarryford (in present-day County Antrim) and Ballymena before his defeat by high-king Flann Sinna mac Maíl Sechnaill of the Clann Cholmáin Uí Néill at the Battle of Crossakiel (in present-day County Meath). Following Flann's death in 916, Niall succeeded him as High King of Ireland. It was during his reign in which he would reestablish the Óenach Tailteann, a traditional gathering of Irish clans. He was married to Gormflaith ingen Flann Sinna. With the support of the clans of Leth Cuinn (Northern half of Ireland), the Uí Néill eventually acknowledged his claim to the throne.

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