In 1826 the 5th Earl was created Marquess of Bristol and Earl Jermyn, of Horningsheath in the County of Suffolk, both in the Peerage of the United Kingdom. On his death in 1859 the titles passed to his eldest son Frederick (1800–1864). The 2nd Marquess was a Tory politician and was Treasurer of the Household under Sir Robert Peel from 1841 to 1846. When he died, the marquessate passed to his eldest son, also named Frederick. Before succeeding as 3rd Marquess, he had represented the traditional family seat in parliament and also served as Lord-Lieutenant of Suffolk. The 3rd Marquess died without male issue and was succeeded in turn by two of his nephews, the sons of Lord Augustus Hervey, second son of the 2nd Marquess. The 4th Marquess was a rear-admiral in the Royal Navy and also sat, as his uncle had done, as Conservative Member of Parliament for Bury St Edmunds. He had no sons and was succeeded in the Hervey titles and estates by his younger brother. The 5th Marquess was Minister and Consul-General to Colombia from 1919 to 1923, and Minister to Peru and Ecuador from 1923 to 1929. His only son, the 6th Marquess, was chancellor of the Monarchist League. He moved to Monte Carlo in early 1979 as tax exile, where he died on 10 March 1985.