In Bernardo Bertolucci’s The Last Emperor, there is a scene in the Forbidden City after the 1911 Republican Revolution in which the already abdicated last emperor P’u-i (John Lone) warned his two chief eunuchs with these words: “I’ve recently learned that many pieces from the imperial collections were on sale in the antique stores of Peking!” Palace eunuchs were notorious thieves of imperial treasures. The Forbidden City, first built from 1406 to 1420, was not...