License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Anonymous, Netherlandish, 15th century. Song of Praise in Heaven over the Fall of the Whore of Babylon; The Wedding of the Lamb from an Apocalypse block book, 2nd edition, 1440–1450. The Metropolitan Museum of Art.