The Royal Standard of the Prince of Wales, later George IV (1762-1830). A hand-sewn and painted silk standard with a linen hoist. It was flown by the yacht 'Jupiter' and the Royal yacht when these ships conveyed George's future bride, Princess Caroline of Brunswick, from the River Elbe to England in 1795. The Prince had already secretly married Maria Fitzherbert in 1785 and the official match with Caroline was not a successful one; the royal couple separated in 1796. After George IV's accession, the cabinet prepared a parliamentary bill to strip Caroline of her title and end her marriage. It resulted in a massive public scandal and the bill was eventually defeated.

The flag was presented to the Royal United Service Institute by Edward VII.

The heraldic description of the arms is as follows: in the first quarter, the arms of England and Scotland impaled; second quarter: azure, three fleur-de-lis, or (France); third quarter: azure, a harp, or (Ireland); fourth quarter: the arms of Hanover. The latter are Gules, two lions passant guardant in pale or (for Brunswick); Or, semé of hearts gules, a lion rampant azure (for Luneburg); gules, a horse courant argent (for Westphalia). The standard has the Prince of Wales's label with two points (the third point appears to be missing).