Apollo is a god in Greek mythology, and one of the Twelve Olympians. He is the son of Zeus and Leto and the twin brother of Artemis. He is the god of healing, medicine, archery, music, poetry and the sun. He is the leader of the Muses. He also is a god of prophecy, and his Oracle at Delphi is very important. He also is the god of justice. During the 5th century BC, Apollo became also known as the god of Sun, becoming one with the god Helios, and getting the name Phoebus. He is shown as a young man, wearing a laurel wreath and playing the kithara (lyre). It is known as his symbol. His other symbols include the raven.