Apollo (Attic, Ionic, and Homeric Greek: Ἀπόλλων, Apollōn (gen.: Ἀπόλλωνος); Doric: Ἀπέλλων, Apellōn; Arcadocypriot: Ἀπείλων, Apeilōn; Aeolic: Ἄπλουν, Aploun; 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. The ideal of the kouros (a beardless, athletic youth), Apollo has been variously recognized as the god of light and the sun, truth and prophecy, healing, plague, music, poetry, and more.
As the patron of Delphi (Pythian Apollo), Apollo was an oracular god —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.
Amongst the god's custodial charges, Apollo became associated with dominion over colonists, and as the patron defender of herds and flocks. As the leader of the Muses (Apollon Musegetes) and director of their choir, Apollo functioned as the patron god of music and poetry. Hermes created the lyre for him, and the instrument became a common attribute of Apollo. Hymns sung to Apollo were called paeans.