Lawrence was the most fashionable and also the greatest portraitist of his generation. He was made Principal Painter to George III in 1792 after Reynolds’s death, and received occasional commissions; however it was only after 1814 that George IV began to employ him in earnest.

This portrait was commissioned by George IV at a cost of 300 guineas and was painted in two campaigns: it was exhibited at the Royal Academy in 1815 and must have been re-worked during sittings in 1818 and 1819 at Aix-la-Chapelle and Vienna, though it remained in Lawrence's studio until his death.Richard Evans was paid 50 guineas for completing the portrait. The portrait seems to have always been intended for what became the 'Waterloo Chamber' and acknowledges the sitter’s role as Hanoverian Minister of State and representative at the Congress of Vienna. In this portrait his is shown wearing court uniform with the ribbon and star of the Royal Hanoverian Guelphic Order.

The Waterloo Chamber is a great hall on the public route at Windsor Castle displaying portraits of those soldiers, sovereigns and diplomats responsible for the overthrow of Napoleon and the re-establishment of the monarchies and states of Europe thereafter. The concept began in 1814 when George IV used the opportunity of the Treaty of London to commission Lawrence to paint distinguished visitors. The group of portraits grew during the next decade as Lawrence continued to obtain portrait sittings at the various congresses following the Battle of Waterloo in 1815 and, in some cases, by making special journeys. Most of the twenty eight portraits were delivered after his death on 7 January 1830. By this time work was already begun of the space of the Waterloo Chamber created by covering a courtyard at Windsor Castle with a huge sky-lit vault; the room was completed during the reign of William IV (1830-7). The first illustration of the interior is provided by Joseph Nash (1809-78) in 1844 (RCIN 919785) and shows the arrangement which survives to this day: full-length portraits of warriors hang high, over the two end balconies and around the walls; at ground level full-length portraits of monarchs alternate with half-lengths of diplomats and statesmen.