Endymion and Selene
Metropolitan Museum of Art
In classical mythology Endymion was beloved by Selene, the goddess of the moon. When she saw him lying so beautiful in his sleep, she asked Zeus to give him eternal life. He did, but unfortunately he made Endymion live forever in sleep. Endymion's pose here was a familiar way for classical artists to express that a mythological subject was asleep. It was adapted by Christian artists portraying the sleep of Jonah in Jonah 4:5-8.
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Source: Marie-Lan Nguyen via Wikimedia Commons