What epic poem tells the story of a man who must rescue his beautiful wife from a demon-king?

"The Epic of Gilgamesh" is an ancient Mesopotamian epic poem that tells the story of Gilgamesh, a powerful king who sets out to rescue his friend Enkidu from the demon Humbaba. While the poem does not involve a man rescuing his wife from a demon-king, it explores themes of friendship, mortality, and the pursuit of immortality.