The titles Baron O'Neill and Viscount O'Neill had been created in the Peerage of Ireland in 1793 and 1795 respectively for the 1st Earl's father, John O'Neill. On the death of the 1st Earl the Earldom and Viscountcy of Raymond became extinct, while the Barony and Viscountcy of O'Neill passed to his younger brother. On his death in 1855, these titles became extinct as well. However, his estates were inherited by his cousin, the Revd William Chichester, who assumed the surname of O'Neill in lieu of Chichester the same year. In 1868 the O'Neill title was revived when he was created Baron O'Neill, of Shane's Castle in the County of Antrim, in the Peerage of the United Kingdom. This title is still extant.

Viscounts O'Neill (1795)

• John O'Neill, 1st Viscount O'Neill (1740-1798)
• Charles Henry St John O'Neill, 2nd Viscount O'Neill (1779-1841) (created Earl O'Neill in 1800)

Earls O'Neill (1800)

• Charles Henry St John O'Neill, 1st Earl O'Neill (1779-1841) (elected a representative peer in 1800)

Viscount O'Neill (1795) (continued)

• John Bruce Richard O'Neill, 3rd Viscount O'Neill (1780-1855) (elected a representative peer in 1843)

See also

• Baron O'Neill