The hero known for his journey to the underworld to retrieve his wife Eurydice is Orpheus. In ancient Greek mythology, Orpheus, gifted with the power of music, descends into the underworld after the tragic loss of Eurydice. His enchanting music moves Hades and Persephone, allowing him to lead her back to the surface under the condition that he must not look back at her until they reach the living world. This poignant myth emphasizes themes of love, loss, and the limits of human courage.