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King of bohemia

Picture of the king of Bohemia and his mistress

Snuff box

Wilhelm Gottsreich Sigismond von Ormstein's snuff box

Wilhelm Gottsreich Sigismond von Ormstein, also known as the King of Bohemia, was a fictional character from the Sherlock Holmes stories, native to the Earth kingdom of Bohemia.

In 2365, Data, posing as Sherlock Holmes on the holodeck, informed Inspector Lestrade that a photograph of the king and his mistress was about to be used for blackmail. The holoprogram also included von Ormstein's snuff box, placed on the mantelpiece in Sherlock Holmes' apartment. (TNG: "Elementary, Dear Data")

The character was from the story A Scandal in Bohemia, and was additionally mentioned to be deceased in His Last Bow, the last Holmes story set shortly before World War I.
The two unconnected mentions of the character in the episode seem to be out of order: initially Data showcases a snuff box implied to be a present from von Ormstein for solving his case, only for Data to be presented that case shortly later. Since the first mention only calls the character von Ormstein, and the second only refers to the king of Bohemia, the two might actually be considered different characters within the world of Star Trek.