Lucas Horenbout, often called Hornebolte in England, was a Flemish artist who moved to England in the mid-1520s and worked there as "King's Painter" and court miniaturist to King Henry VIII from 1525 until his death. He was trained in the final phase of Netherlandish illuminated manuscript painting, in which his father Gerard was an important figure, and was the founding painter of the long and distinct English tradition of portrait miniature painting. He has been suggested as the Master of the Cast Shadow Workshop, who produced royal portraits on panel in the 1520s or 1530s.

A portrait miniature is a miniature portrait painting, usually executed in gouache, watercolor, or enamel. Portrait miniatures developed out of the techniques of the miniatures in illuminated manuscripts, and were popular among 16th-century elites, mainly in England and France, and spread across the rest of Europe from the middle of the 18th century, remaining highly popular until the development of daguerreotypes and photography in the mid-19th century. They were usually intimate gifts given within the family, or by hopeful males in courtship, but some rulers, such as James I of England, gave large numbers as diplomatic or political gifts. They were especially likely to be painted when a family member was going to be absent for significant periods, whether a husband or son going to war or emigrating, or a daughter getting married.