Apollo (Greek: Ἀπόλλων; Latin: Apollō) is one of the most important and complex of the Olympian deities in ancient Greek and Roman religion, Greek and Roman mythology, and Greco–Roman Neopaganism. Apollo is the ideal of the kouros (a beardless, athletic youth), and has been variously recognized as a god of light and the sun, truth and prophecy, healing, plague, music, poetry, and more. Apollo is the son of Zeus and Leto, and has a twin sister, the chaste huntress Artemis. Apollo is known in Greek-influenced Etruscan mythology as Apulu.
Apollo was the patron of Delphi, the prophetic deity of the Delphic Oracle. Medicine and healing are associated with Apollo, whether through the god himself or mediated through his son Asclepius, yet Apollo was also seen as a god who could bring ill-health and deadly plague. Apollo is the patron defender of herds and flocks. As the leader of the Muses and director of their choir, Apollo also functioned as the patron god of music and poetry. The god Hermes created the lyre for him, and the instrument became a common attribute of Apollo. Hymns sung to Apollo were called paeans.
In Hellenistic times, Apollo became known Apollo Helios, being identified among Greeks with Helios, Titan god of the sun, and his sister Artemis similarly equated with Selene, Titan goddess of the moon.
(Names of Greek Gods and Goddesses – Apollo)