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In page Apollo:

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The chief Apollonian festival was the Pythian Games held every four years at Delphi and was one of the four great Panhellenic Games. Also of major importance was the Delia held every four years on Delos. Athenian annual festivals included the Boedromia, Metageitnia,[1] Pyanepsia, and Thargelia. Spartan annual festivals were the Carneia and the Hyacinthia. Thebes every nine years held the Daphnephoria.[citation needed]