The title
Earl of Longford was first bestowed upon Francis Aungier in
1677. His brother Ambrose Aungier succeeded him and died without an heir. Their niece, Elizabeth Cuffe, married Thomas Pakenham in
1739 and in
1756 he was created Baron of Longford. On Thomas' death in
1766 their son, Edward Michael Pakenham, became the 2nd Baron Longford. In
1785 Elizabeth was raised to the rank of Countess of Longford and on her death in 1792 her grandson (who had already acceded to the title of 3rd Baron Longford on the death of his father in
1792) became Thomas Pakenham, 2nd Earl of Longford.
- Sir Francis Aungier (c.1562-1632) was created Baron Aungier of Longford, in 1621.
- Gerald Aungier, 2nd Baron Aungier of Longford, (-1655)
- Thomas Pakenham 1st Baron Longford[?] (1713-1776
- Edward Michael Pakenham, 2nd Baron Longford[?] (1743-1792)
- Elizabeth (Cuffe) Pakenham, Countess of Longford[?] (-1794)
- Thomas Pakenham, 2nd Earl of Longford[?], 3rd Baron Longford (1774-1835)
- Edward Michael Pakenham, 3rd Earl of Longford[?] (1817-1860)
- William Lygon Pakenham, 4th Earl of Longford[?] (1819-1887)
- Thomas Pakenham, 5th Earl of Longford[?] (1864-1915)
- Edward Arthur Henry Pakenham, 6th Earl of Longford[?] (1902-1961)
- Francis Aungier Pakenham, 7th Earl of Longford, Baron Pakenham of Cowley (1905-2001)
- Thomas Francis Dermot Pakenham, 8th Earl of Longford[?] (1933 - )