Barons Milton of Shronehill in the Peerage of Ireland (1753-1808)
Barons Milton of Milton Abbey in the Peerage of Great Britain (1762-1808)
Earls of Dorchester in the Peerage of Great Britain (1792-1808)
Earls of Dorchester
- Joseph Damer, 1st Earl of Dorchester and Viscount Milton, 1st Baron Milton of Shronehill, 1st Baron Milton of Milton Abbey (1718–1798)
- George Damer, 2nd Earl of Dorchester (1746–1808)
Barons Dawson of Dawson's Court in the Peerage of Ireland (1770)
Viscounts Carlow in the Peerage of Ireland (1776)
Earls of Portarlington in the Peerage of Ireland (1785)
1st and 2nd Earls of Portarlington
- William Henry Dawson, 1st Viscount Carlow, 1st Baron Dawson (1712–1779) married Mary Damer (d. 1769) sister and heiress in her issue of Joseph Damer, 1st Earl of Dorchester.
- John Dawson, 1st Earl of Portarlington, 2nd Viscount Carlow (1744–1798)
- John Dawson, 2nd Earl of Portarlington (1781–1845)
3rd Earl of Portarlington onwards
- Henry John Reuben Dawson-Damer, 3rd Earl of Portarlington KP (1822–1889) assumed the additional surname of Damer on inheriting the large Milton Abbey estate in Dorset from his aunt Lady Caroline Damer, sister of 2nd Earl of Dorchester.
- Lionel Seymour William Dawson-Damer, 4th Earl of Portarlington (1832–1892)
- George Lionel Henry Seymour Dawson-Damer, 5th Earl of Portarlington (1858–1900)
- Lionel Arthur Henry Seymour Dawson-Damer, 6th Earl of Portarlington (1883–1959)
- George Lionel Yuill Seymour Dawson-Damer, 7th Earl of Portarlington (born 1938)