1744–1831
National Gallery of Art, 1939
National Gallery of Art, 1480
National Gallery of Art, 1802
National Gallery of Art, 1673
National Gallery of Art, 1911
National Gallery of Art, 1551
National Gallery of Art, 1602
National Gallery of Art, 1936
National Gallery of Art, 1500
National Gallery of Art, 1502
National Gallery of Art, 1969
National Gallery of Art, 1884
![Giangaleazzo Maria Sforza, 1469-1494, 6th Duke of Milan 1476 [obverse]](https://api.nga.gov/iiif/da01db2f-21b2-48a9-adc6-9dd7a44f7e22/full/843,/0/default.jpg)
![Detailstudie eines Violoncello (Study of a Violin) [p. 1]](https://api.nga.gov/iiif/5df67391-3fb8-4a82-b902-78f193653706/full/843,/0/default.jpg)