License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Martin van Meytens the Younger. Count Giacomo Durazzo (1717–1794) and Ernestine Aloisia Ungnad von Weissenwolff (1732–1794), probably early 1760s. The Metropolitan Museum of Art.