Kings of France
King Henri III
King Henri III of France in Classic Black Dress
These portraits share two things: somber dress and the cordon of the Order of the Saint-Esprit, founded by the king. The cordon has aged: the orginal blue and is now green or black.
Portraits should date after the 1578 foundation of the order. Many curiously resemble the chalk drawings often attributed to the period 1582-5. Finally, some are attributed to as early 1574.
I think the kinbg has two holes in his right ear here - hard to tell though:
The pearl in the earring is a lot smaller here:
Images: RMN