Gillray's caricatures are generally divided into two classes, the political series and the social, though it is important not to attribute to the term "series" any concept of continuity or completeness. The political caricatures comprise an important and invaluable component of the history extant of the latter part of the reign of George III. They were circulated not only in Britain but also throughout Europe, and exerted a powerful influence both in Britain and abroad. In the political prints, George III, George's wife Queen Charlotte, the Prince of Wales (later Prince Regent, then King George IV), Fox, Pitt the Younger, Burke and Napoleon Bonaparte are the most prominent figures. In 1788 appeared two fine caricatures by Gillray. "Blood on Thunder fording the Red Sea" represents Lord Thurlow carrying Warren Hastings through a sea of gore: Hastings looks very comfortable, and is carrying two large bags of money. "Market-Day" pictures the ministerialists of the time as cattle for sale.