Cormac was the son of Matthew O'Neill, 1st Baron Dungannon, and younger brother of Hugh O'Neill, Earl of Tyrone. His middle name (meaning "son of the Baron") is a reference to his father's title.
Cormac was knighted on August 23, 1605, by Sir Arthur Chichester. [1]
His son Conn O'Neill (or Constantino O'Neill) was an officer in the Spanish Army.
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Categories: Nine Years' War (Ireland) | Battle of the Ford of the Biscuits, 1594 | O'Neill Name Study | O'Neill Dynasty