License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Thomas Rowlandson. The Prospect Before Us, Respectfully dedicated to those Singers, Dancers, & Musical Professors, who are fortunately engaged with the Proprietor of the Kings Theatre, at the Pantheon, January 13, 1791. The Metropolitan Museum of Art.