License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Jean-Baptiste Nini. Portrait of a Man, Anne-Claude-Philippe de Tubières de Grimoard, comte de Caylus, 1692–1765, second half 18th century (before 1786). The Metropolitan Museum of Art.