Category

Irish chiefs of the name

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Hugh O'Neill, Earl of Tyrone

Irish earl and military leader

Hugh Roe O'Donnell

King of Dun na nGall

Fiach McHugh O'Byrne

Lord of Ranelagh and leader of the O'Byrne clan (died 1597)

William O'Brien, 4th Earl of Inchiquin

British earl and politician

Donal Cam O'Sullivan Beare

last independent ruler of the O'Sullivan Beara sept