Marquesses of Thomond (1800)
- Murrough O'Brien, 1st Marquess of Thomond, 10th Baron Inchiquin (1726–1808)
- William O'Brien, 2nd Marquess of Thomond, 11th Baron Inchiquin (1765–1846)
- James O'Brien, 3rd Marquess of Thomond, 12th Baron Inchiquin (1768–1855)
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