Like his siblings, Lord Charles Hamilton was initially given the surname of his mother, Anne Hamilton, suo jure duchess of Hamilton, rather than that of his father, William Douglas, earl of Selkirk, who changed his surname to Hamilton as part of the marriage settlement of 1656. On 20 Sept. 1660, upon the request of the duchess, Charles II created Selkirk duke of Hamilton for life, the title to be held coterminously with his wife. On 6 Oct. 1688, when their second surviving son, Lord Charles Hamilton, was 25 years old, his father resigned to him, by charter of novodamus, his own earldom of Selkirk, and Charles then adopted his father’s old surname of Douglas for himself.
Selkirk had connections with James II’s court, and had received a grant of money from the royal purse in 1687. At the time of William of Orange’s invasion, only a few weeks after receiving his title, Selkirk briefly served as colonel of the regiment of horse raised in 1685 by his elder brother James then styled earl of Arran [S], as Arran himself was moved on to command the Royal Horse Guards. Yet unlike his brother, Selkirk quickly proved himself a firm supporter of the Revolution.
tried to make Earl Selkirk, your cousin, a soldier, and a courtier, and a comrade, and a statesman, and that he finds omnipotency was only able to do these things, he now is to try how he is qualified to be an ambassador. He is to go to Denmark and Sweden. The jests that pass on this occasion cannot be written; they lose their edge in writing. But the misery is there is not so much as one to his advantage.HMC Johnstone, 111.
With one short-lived deviation, Selkirk followed the political line set by his elder brother Arran, who became 4th duke of Hamilton, upon their mother’s resignation of the title, in 1698.
In the 1708 general election Selkirk made efforts to assist his younger brother, Lord Archibald Hamilton, to be returned for Lanarkshire against the rival candidate George Lockhart.
Selkirk was himself in the English capital for most of the session of 1708-9 and kept in close contact with his brothers in Parliament: Lord Archibald in the Commons and Hamilton and Orkney in the House.
With his eight-year-old nephew succeeding to the Hamilton dukedom, Selkirk was obliged to take more responsibility for the family’s business. In February 1713 he went to France to press their claim to the pension granted in 1549 to their ancestor James, 2nd earl of Arran [S], when he was created duke of Châtelherault in the French peerage.
In preparation for the autumn elections in Scotland Selkirk wrote from Paris with detailed instructions, doing all he could to advance the interests of his family and to heal potential rifts between Orkney and their sister-in-law, Hamilton’s widow, who were backing rival candidates.
Despite his scant attendance in the House during Anne’s last parliament, Selkirk remained involved in parliamentary politics after the accession of George I. As early as September 1714 he was discussing with his mother, the old duchess of Hamilton, prospects for the elections in Lanarkshire.
