Artemis was a goddess.
Apollo ( Attic , Ionic , and Homeric Greek : Ἀπόλλων , Apollōn ; Doric : Ἀπέλλων , Apellōn ; Arcadocypriot : Ἀπείλων , Apeilōn ; Aeolic : Ἄπλουν , Aploun ; Apollō ) is one of the most important and complex of the Olympian deities in classical Greek and Roman religion and Greek and Roman mythology . Apollo is the son of Zeus and Leto , and has a twin sister , the chaste huntress Artemis . 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 . Artemis . In the classical period of Greek mythology , Artemis was often described as the daughter of Zeus and Leto , and the twin sister of Apollo . Zeus [ ˈzju : s ] ( Ζεύς , Zeús , [ zdeǔ̯s ] Modern Δίας , Días [ ˈði.as ] ) is the sky and thunder god in ancient Greek religion , who ruled as king of the gods of Mount Olympus . These resulted in many godly and heroic offspring , including Athena , Apollo , Artemis , Hermes , Persephone , Dionysus , Perseus , Heracles , Helen of Troy , Minos , and the Muses .