Delftware is a variety of earthenware with tin oxide added to its lead glaze formula to give an opaque white effect that was often used to imitate, or at least suggest, the appearance of Chinese porcelain. First produced in England in the late 1500s, delftware grew in popularity in the 1600s as potteries flourished in London, Bristol, and elsewhere in the British Isles. Metallic oxides provided a range of colors for decoration: cobalt for blue, manganese for purple, iron for red, copper for green, and antimony for yellow. Delftware was relatively soft and chipped easily. By the mid-1700s, more durable soft-paste porcelains and salt-glazed stonewares grew in popularity; by the early 1800s, delftware production in England had declined dramatically.

This plate depicts the figure of Justice triumphing over a figure holding a scroll inscribed "Placemen," the term given to members of Parliament who simultaneously held appointed government positions. Limiting or eliminating the role of placemen was an important cause for those who advocated for British Parliamentary reforms.