Mary Queen of Scots. Francesco Bartolozzi (Italian, 1727-1815); after Frederico Zuccaro (Italian, c. 1542-1609); published by John Boydell (English, 1719-1804). Date: 1779. Dimensions: 383 x 288 mm (image); 475 x 328 mm (plate); 486 x 336 mm (sheet).