Born at the admiralty where his father, a Portland Whig, was first lord under Pitt, 1794-1800, Spencer followed his elder brother Robert into the navy in 1811 and saw active service off the Spanish coast, most notably at the siege of Tarragon and the evacuation of St. Phillippe Fort. He was made captain of the Creole, 26 Aug. 1822, when his younger brother George commented that ‘having the command of a frigate ... at your age is a seasoning which must be of great service for your future prospects’.
Spencer, who considered ‘a residence in London’ to be ‘contrary to my habits of life’, declined to serve as private secretary to his brother Lord Althorp on his appointment as chancellor of the exchequer in the Grey ministry in November 1830.
On 6 July 1831 his election was attacked by Wetherell, Tory Member for Boroughbridge, who, in a speech against the use of pledges, accused him of having impugned the ‘honour and dignity’ of the House by campaigning under the slogan ‘Spencer and no corn laws’. Spencer, however, denied ‘ever having been party to it’, claiming that he had not ‘on any public occasion alluded to the subject’; he was supported by his colleague Foley. He voted for the second reading of the reintroduced reform bill that day, at least twice against adjourning the debates, 12 July, and gave steady support to its details. On 6 Sept. he suggested that in order to ‘avoid the continual expense of erecting temporary booths’, permanent structures ‘should be erected for taking the poll’, but his advice went unheeded. He voted for the bill’s passage, 21 Sept., and Lord Ebrington’s confidence motion, 10 Oct. He presented a petition from the procurators of Berwickshire for repeal of the duty on attorneys’ certificates, 5 Aug. At the 1831 Cambridgeshire by-election he served on the reformer Townley’s London committee.
At the 1832 general election Spencer redeemed his pledge to retire from Worcestershire and accepted an invitation from the electors of Midhurst, where he was returned unopposed on the interest of his father-in-law. He retired at the dissolution of 1834, explaining that an ‘attendance in Parliament’ was ‘so irksome’, that he ‘could not be (as I fear I have not been) constantly in my place in the House, as I think your representatives ought’; but following the incapacity of his father-in-law, who replaced him, he came in again at the 1837 by-election. He was appointed equerry to the duchess of Kent in 1836, but on the advice of Althorp, who had succeeded as 3rd Earl Spencer in 1834, declined Lord Melbourne’s offer of an additional household office on the accession of Queen Victoria. Since the death of Robert off Alexandria, 4 Nov. 1830, Spencer had been next in line to the peerage, and on Althorp’s death without issue, 1 Oct. 1845, he succeeded to the family estates as 4th earl. He held senior household offices in the Russell, Aberdeen and Palmerston ministries, and was awarded an honorary doctorate by Cambridge University in 1847.
Spencer died at Althorp in December 1857. By his will, dated 17 May 1854, he disinherited the convert George in the event of his succession to the peerage by directing that the family estates be entrusted to his nephew Lord Lyttelton for the use of his daughter Lady Sarah Isabella Spencer and her heirs. By a third codicil, dated 9 Aug. 1854 and revoking all others, special provision was made for any children from his second marriage. His estates passed to his elder son and successor in the peerage, John Poyntz (1835-1910), who at the general election in April 1857 had been returned as a Liberal for Northamptonshire South.
