Catherine O'Neill, Countess of Tyrone (died 1618) (d. 1618) Parents Hugh Magennis Children Ellis MacDonnell, Countess of Antrim Conn O'Neill Brian O'Neill Shane O'Neill Henry O'Neill Sarah O'Neill Margaret O'Neill Siblings Arthur Magennis, 1st Viscount Magennis of Iveagh Rose Guinness Partners Hugh O'Neill, Earl of Tyrone