License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Anne Claude Philippe de Tubières, comte de Caylus. The martyrdom of Saint Angelo who in the upper left is being stabbed watched by horrified onlookers, from the 'Cabinet Crozat', 1729–64. The Metropolitan Museum of Art.