Mercury Entering Herse's Room. Dated: 1590. Dimensions: plate: 17.8 x 25.6 cm (7 x 10 1/16 in.) sheet: 18.4 x 26.1 cm (7 1/4 x 10 1/4 in.). Medium: engraving on laid paper. Museum: National Gallery of Art, Washington DC. Author: Dutch 16th Century af