Sten was an artist from Marcus II.

Flint possessed one of his works among the collections he kept in his castle on Holberg 917G. (TOS: "Requiem for Methuselah")

This character was only mentioned in dialogue.
Several other individuals whose art Flint possessed in his collection (Brahms, Leonardo) were later revealed to have been Flint himself, who had assumed these identities.
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