The hero known for his quest for immortality in Babylonian mythology is Gilgamesh. Featured in the epic poem "Epic of Gilgamesh," he embarks on a journey to discover the secret of eternal life after the death of his close friend, Enkidu. Throughout his travels, Gilgamesh encounters various characters and challenges, learning about the inevitability of death and the value of friendship, wisdom, and legacy. His quest reflects deep human concerns about mortality, making the story enduring and relevant even through millennia, resonating with the fundamental human search for meaning and understanding of life.