The 'jewel' was given by King James to Thomas Lyte (1568-1638) in appreciation of his gift of an illuminated pedigree which traced the King's ancestry back to the mythical founder of Britain. Lyte presented the pedigree to the King at the Palace of Whitehall in 1610 in the presence of the Prince of Wales and the court. A portrait of him, shown proudly wearing the jewel, was painted in 1611.
King James, the son of a Catholic, Mary Stuart, queen of Scotland, had succeeded to the throne of England in 1603. As a Protestant and the first Stuart monarch of England, he saw the political necessity to emphasize his ancient lineage not only through the Tudor line, but also through his Welsh ancestry back to the first king of the Britons. It is possible that Lyte, a relatively unknown member of the gentry, was encouraged by James' advisors to produce the genealogical table, and to present it with full publicity at court, as if spontaneously from a loyal subject.