John O'Neill, 3rd Viscount O'Neill
O'Neill was the son of John, Viscount O'Neill and his wife Henrietta Frances Boyle.
O'Neill died at the age of 74. His title became extinct, but his estates passed to a relative, William Chichester, who subsequently assumed the surname O'Neill and received the Barony of O'Neill.
Hansard 1803–2005: contributions in Parliament by Hon. John O'Neill
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