Donnell O'Neill (Irish: Domhnall Ua Néill) was a king of Tyrone in medieval Ireland. He was the son of Brian O'Neill of the battle of Down.[1] O'Neill was king of Tyrone on several occasions contesting the kingship with his kinsman Niall Culanach and Brian O'Neill who both had the support of the Earldom of Ulster.[1]
O'Neill was seemingly only a boy when his father was killed at the Battle of Down in 1260. He married Gormflaith, the daughter of Donnell Óg O'Donnell, king of Tyrconnell. His father-in-law was killed in 1281 by O'Neill's cousin and rival, Hugh Boy O'Neill, at the Battle of Desertcreat.[2] O'Neill is perhaps best known for sending a Remonstration to Pope John XXII in 1317, in which he complains of the actions of the English in Ireland, calling on the Pope to support Edward Bruce as King of Ireland (brother of Robert the Bruce, King of Scots).[3][4]
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