Only supernatural forces could defeat him, and it was magic that ended his mortal life. When the fury passed, though, Heracles was full of sorrow and guilt for what he had done and ready to accept any punishment for his misdeeds. Easily angered, his sudden outbursts of rage often harmed innocent bystanders. Heracles (called Hercules by the Romans) was not blessed with great intelligence, but his bravery made up for any lack of cunning.
Besides tremendous physical strength, he had great self-confidence and considered himself equal to the gods. The greatest of all heroes in Greek mythology, Heracles was the strongest man on earth.
Son of Zeus and Alcmena Character Overview Hesiod's Theogony, Apol-lodorus's Bibliotheca