RCIN 405142
https://www.rct.uk/collection/405142/louis-antoine-duke-of-angouleme-1775-1844-0
Subject: Louis-Antoine, Duke of Angoulême (1775-1844)
Artist: Sir Thomas Lawrence
More about the Waterloo at Windsor:
https://www.rct.uk/collection/themes/exhibitions/waterloo-at-windsor/windsor-castle