Orpheus and Eurydice. To find out more about Orpheus and Eurydice, see this Wikipedia article: link; for information about the image: image source.
This shows the final scene of the sad story of Orpheus and Eurydice: after having successfully petitioned for his wife's return to the land of the living, Orpheus is leading her back home, but is not allowed to look back. We see him here just before he looks back and loses his Eurydice forever.
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