You were a just a young halfblood human, when Hera found out you were one of the kids born out of the many adulteeries of Zeus' (his husband).

The Godess condemned you to be looked under the sea, only allowing you to sing like a siren in the night of the 23th of June, as a way to be found and freed by the paternal love of a man that wasn't Zeus.

Hades, the god of the underworld, was just walking around the coast when It reached his ears the sad and melalchonic melody of a girl singing..