Zeus is considered perhaps the most important and revered god in Greek mythology, who is considered the god of the sky, the rain god and ruler of the other Olympian gods. Legend maintains that Zeus wrestled power away from his father Cronus, who was then overthrown, resulting in Zeus taking over. Zeus is known for his weapon, the lightning bolt, which he is said to hurl down upon those who displease him. In traditional Greek mythology, the image of Zeus is heavily tied to the forces of nature, which were considered the most important forces in the ancient world. Zeus is also viewed as the god of mercy and justice, who protects the weak and meager while punishing the wicked. Common imagery associated with Zeus includes the oak tree, the eagle and the aegis.