License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Giovanni Battista Brustolon. Plate 5: The Doge in the Bucintoro Departing for the Porto di Lido on Ascension Day, from 'Ducal Ceremonies and Festivals' (Le Feste Ducali), ca. 1766. The Metropolitan Museum of Art.