Leuthotea was a sea goddess, Greco-Roman, popular wither fishing communities along the Mediterranean coast.
Probably derived from a mermaid, originally named Ino, and became the mortal daughter of Kadmos. She, according to legend, wet nursed Dionysus (Bacchus), but went insane and threw herself into the sea with her son Melikertes.
In another version of this story she was escaping the wrath of Athanas, King of Thebes. The gods made her a goddess, and her son became the god Palaemon. A.G.H.
Jordan, Michael, Encyclopedia of Gods, New York, Facts On File, Inc. 1993, p. 145