Murtagh Dulenach O'Neill

Murtagh Dulenach O'Neill (Irish: Muirchertach Dulenach Ó Néill) was a lord of Clandeboye in medieval Ireland. A son of Niall Mór O'Neill, he succeeded his brother, Niall Oge O'Neill, to the lordship of Clandeboye after his death in 1537.[1]

His hold over Clandeboye was gradually weakened by his nephews, the sons of Niall Oge and Phelim Bacagh O'Neill.[2][1] By 1533 he was lord of Clandeboye in name only as his rivals had divided the majority of Clandeboye between them founding the lordships of Lower and Upper Clandeboye. Despite having eight "tall sons", they could only muster twenty-four horsemen between them. As such he was the last of the family to be lord over the entirety of Clandeboye.[1] O'Neill died after 1556, however as a sign of how far his stock had fallen his death was not recorded.[1]

O'Neill was married to Margaret O'Byrne of Wicklow and had a son called Daniel.[2] Another son, Hugh, along with his family retained some land until the seventeenth-century around Toome in south-west modern-day County Antrim, Northern Ireland.[1]