Descendants of Brian Boru himself — High King of Ireland, and the man who broke Viking power at Clontarf.
The O’Brien certificate.
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Gaelic Origin · Descendants of Brian Boru
O'Brien descends directly from Brian Bóruma — Brian Boru — the Dál gCais king from Clare who became High King of Ireland and shattered Viking power at the Battle of Clontarf in 1014. Few Irish surnames trace to a single, verifiable historical figure this cleanly.
A name still carried by the Barons Inchiquin today — direct, unbroken descent from a king whose victory is still marked every Easter Monday in Clontarf.
Irish form: Ó Briain
