His son George Legge was a prominent naval commander, who in 1682 was raised to the Peerage of England as Baron Dartmouth, of Dartmouth in the County of Devon. George's son William, the second Baron, notably served as Secretary of State for the Southern Department between 1710 and 1713 and in 1711 was created Viscount Lewisham, in the County of Kent, and Earl of Dartmouth, in the Peerage of Great Britain.
The latter was succeeded by his eldest son, the seventh Earl, who married Lady Ruperta, daughter of the 1st Marquess of Lincolnshire. Lady Ruperta inherited a share of the office of Lord Great Chamberlain from her father, and after his father-in-law's death in 1928, Lord Dartmouth acted as Deputy Lord Great Chamberlain until the death of George V in 1936.
The seventh earl's only son, William Legge, Viscount Lewisham, was killed at El Alamein in 1942, and Dartmouth was consequently succeeded by his younger brother, Humphry, the eight Earl.
As of 2018, the titles are held by Humphry's grandson, the tenth Earl, who succeeded his father in 1997. Lord Dartmouth was a Member of the European Parliament for the UK Independence Party between 2009 and 2019, but left the party in 2018, becoming an independent member.
The heir presumptive is the present holder's brother, the Hon. Rupert Legge (born 1951).
The heir presumptive's heir apparent is his son, Edward Legge (born 1986).
Male-line family tree
Male-line family tree
Male-line family tree, Barons Dartmouth and Earls of Dartmouth.