Apollo (in Greek, Ἀπόλλων—Apóllōn or Ἀπέλλων—Apellōn), is one of the most important and diverse of the Olympian deities. The ideal of the kouros (a beardless, athletic youth), Apollo has been variously recognized as a god of light and the sun; truth and prophecy; medicine, healing, and plague; music, poetry, and the arts; and more. Apollo is the son of Zeus and Leto, and has a twin sister, the chaste huntress Artemis.