License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Thomas Rowlandson. Rehearsal of a French Invasion as Performed before the Invalids at the Islands of St Marcou on the Morning of the 7th of May 1798, May 18, 1798. The Metropolitan Museum of Art.