Lady Dou Wan was the wife of Liu Sheng; Prince of Zhongshan; of the Western Han Dynasty. Her tomb was discovered in 1968 in Mancheng County; Hebei. Her body was encased in a jade burial suit.

Among the artefacts found in the tomb was a gilt bronze figure of a maidservant holding an oil-lamp; the 'Changxin Palace Lamp'. Not only was the palace maid beautifully sculptured; the lamp and its cover were cleverly designed so that both the lamp's illuminating power and the direction of its rays were (and still are) adjustable.