Mermaid
A popular Greek legend turns Alexander the Great's sister into a mermaid after she died. She lived, it was said, in the Aegean that when she met a ship, she asked its sailors only one question: "Is King Alexander alive?" (;") The answer was "He lives and reigns and conquers the world" (Greek: "Ζει και βασιλεύει και τον κόσμο κυριεύει"). If they answered her question correctly, she calmed the waters for the ship, but any other answer would make her angry, and raise a storm.