Which of these movies based on Greek mythology is your favorite?
Should Spartacus count? The story happens during Roman history, and I understand he was of Thracian,origin, not Greek.
Il Primo Re seems to be about Romulus and Remus, that is Roman mythology rather than Greek.
Cleopatra may be related to the ptolemaic dynasty, but she was born in Alexandria and pretty much everyone would relate her to Egypt or Rome, but not to Greek history or mythology.
Perseo l'Invincibile (1963)
Orpheus & Eurydice (2000)
Atlantis: The Lost Continent (1961)