License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Pietro Santi Bartoli. Plate 2: Cain and Abel from Genesis Chapter 4, after a lost fresco in the basamento of Bay 2 of the Vatican Loggia, 1650–77. The Metropolitan Museum of Art.