In Greek mythology, the hero who famously battled the hydra is Heracles, also known as Hercules in Roman mythology. As part of his twelve labors, he faced the multi-headed serpent-like monster, which regenerated heads when one was cut off. Heracles ultimately defeated the Hydra with clever tactics, demonstrating not only physical strength but also ingenuity, a hallmark of his heroic journey and an emblematic story within mythological traditions.