The Last Valois
Kings of France
King Henri III
King Henri III of France in Classic Black Dress
These portraits share two things: somber dress and the blue cordon of the Order of the Saint-Esprit, founded by the king.
So, all 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.
The portraits in the enormous series of oil paintings at the chateau de Beauregard are notoriously poor: the subjects all look sneaky and slant-eyed.
The image from Solnon's book appears to be a copy of the Louvre portrait, but flipped either in the original (via camera oscura) or by the publisher.
