The title Duke of Manchester was created for Charles Montagu, 4th Earl of Manchester, in 1719.
The subsidiary titles of the Duke of Manchester are: Earl of Manchester (created 1626), Viscount Mandeville (1620) and Baron Montagu of Kimbolton (1620). The dukedom itself is in the Peerage of Great Britain, but all of the subsidiary titles are in the Peerage of England. The courtesy title used for the eldest son and heir of the Duke of Manchester is Viscount Mandeville.
Previously, the title Earl of Manchester was created for Sir Henry Montagu, who served in several public offices, including Recorder of London, Lord Chief Justice of England and Wales, Lord High Treasurer and Lord Privy Seal. His successor, the fourth Earl, who became Duke of Manchester, served as a Privy Counsellor and as a diplomat. The fourth Duke of Manchester was another member of the family who was a politician; he was a very active member of the House of Lords.
Edward Montagu, 2nd Earl of Manchester KG (1602 – May 5, 1671), eldest son of the first earl by his first wife, Catherine Spencer, granddaughter of Sir John Spencer of Althorpe, was born in 1602, and was educated at Sidney Sussex College, Cambridge.
At the outbreak of the Civil War, having succeeded his father in the earldom in November 1642, Manchester commanded a regiment in the army of Robert Devereux, 3rd Earl of Essex, and in August 1643 he was appointed Major-General of the parliamentary forces in the eastern counties, with Cromwell as his second in command.
Manchester was made a Knight of the Order of the Garter in 1661, and became a Fellow of the Royal Society in 1667.