Eurystheus was a king in ancient Greek mythology, known primarily for his role in the stories of Heracles. He was the ruler of Tiryns and was often portrayed as a cowardly and jealous leader. Eurystheus assigned the famous Twelve Labors to Heracles, hoping that the dangerous tasks would lead to his demise. Instead, Heracles completed each labor, showcasing his incredible strength and bravery. Eurystheus's character highlights themes of jealousy and insecurity. His fear of Heracles's power made him a significant figure in the hero's journey. Ultimately, Eurystheus's attempts to undermine Heracles only led to his own humiliation and the hero's legendary status.