People / group

O'Neill dynasty

Also known as Ua Néill

The O'Neill dynasty, Ua Néill in Irish, was a branch of the Cenél nEógain of the northern Uí Néill, named after Niall Glúndub, a high king killed in 919. After their Mac Lochlainn rivals declined in the 13th century, they ruled Tír Eógain (Tyrone) in Ulster as kings. They remained the leading Gaelic dynasty of the north until the Nine Years' War and the Flight of the Earls in 1607.

O'Neill dynasty
Image: Cookieman1.1.1 · CC BY-SA 4.0 · Wikimedia Commons

Mentioned in 5 state histories

Dal nAraidiKingdom of AilechKingdom of Tir EoghainEarldom of UlsterKingdom of Fermanagh

See also

Cite this entry
APA
The Epoch Institute. (2026). O'Neill dynasty. In The Epoch Institute Encyclopedia. https://the-epoch-institute.org/encyclopedia/o-neill-dynasty
MLA
“O'Neill dynasty.” The Epoch Institute Encyclopedia, The Epoch Institute, 2026, https://the-epoch-institute.org/encyclopedia/o-neill-dynasty. Accessed .
Chicago
The Epoch Institute. “O'Neill dynasty.” The Epoch Institute Encyclopedia. 2026. https://the-epoch-institute.org/encyclopedia/o-neill-dynasty.
Harvard
The Epoch Institute (2026) ‘O'Neill dynasty’, The Epoch Institute Encyclopedia. Available at: https://the-epoch-institute.org/encyclopedia/o-neill-dynasty (Accessed: ).

Last reviewed October 2026Random entry ↻