Greek and Roman Mythology

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Across
  1. 3. Half-man, half-horse (7)
  2. 4. 5th letter of the Greek alphabet (7)
  3. 6. Mythological sea-serpent with multiple heads (5)
  4. 7. Greek Hero known for his extraordinary strength (8)
  5. 8. The wife of Jupiter in Roman mythology (4)
Down
  1. 1. The number of major Gods in Greek mythology (6)
  2. 2. Titan who is condemned to hold up the sky for eternity (5)
  3. 5. Greek King of Ithaca (8)
  4. 7. The Greek god of the dead (5)