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Tales of mermaids are nearly universal. The first known mermaid stories appeared in Assyria, ca. 1000 BC. Atargatis, the mother of Assyrian queen Semiramis, was a goddess who loved a mortal shepherd and in the process killed him. Ashamed, she jumped into a lake to take the form of a fish, but the waters would not conceal her divine beauty. Thereafter, she took the form of a mermaid — human above the waist, fish below — though the earliest representations of Atargatis showed her as being a fish with a human head and legs, similar to the Babylonian Ea. The Greeks recognized Atargatis under the name Derketo. Prior to 546 BC, the Milesian philosopher Anaximander proposed that mankind had sprung from an aquatic species of animal. He thought that humans, with their extended infancy, could not have survived early on. This idea does not appear to have survived Anaximander's death.

A popular Greek legend has Alexander the Great's sister, Thessalonike, turn into a mermaid after she died.[1] She lived, it was said, in the Aegean and when sailors would encounter her, she would ask them only one question: "Is Alexander the king alive?" (Greek: Ζει ο βασιλι?ς Αλ?ξανδρος;), to which the correct answer would be "He lives and still rules" (Greek: Ζει και βασιλε?ει). Any other answer would spur her into a rage, where she transformed into a Gorgon and meant doom for the ship and every sailor onboard.

Lucian of Samosata in Syria (2nd century AD) in De Dea Syria ("Concerning the Syrian Goddess") wrote of the Syrian temples he had visited:

"Among them - Now that is the traditional story among them concerning the temple. But other men swear that Semiramis of Babylonia, whose deeds are many in Asia, also founded this site, and not for Hera Atargatis but for her own Mother, whose name was Derketo"
"I saw the likeness of Derketo in Phoenicia, a strange marvel. It is woman for half its length, but the other half, from thighs to feet, stretched out in a fish's tail. But the image in the Holy City is entirely a woman, and the grounds for their account are not very clear. They consider fishes to be sacred, and they never eat them; and though they eat all other fowls, they do not eat the dove, for she is holy so they believe. And these things are done, they believe, because of Derketo and Semiramis, the first because Derketo has the shape of a fish, and the other because ultimately Semiramis turned into a dove. Well, I may grant that the temple was a work of Semiramis perhaps; but that it belongs to Derketo I do not believe in any way. For among the Egyptians, some people do not eat fish, and that is not done to honor Derketo." (Source Wikipedia)