According to Herodotus, Labda (Ancient Greek: ) was a daughter of the Bacchiad Amphion, and mother of Cypselus, by Eetion.Aelius Herodianus, v. 92. (cited in Smith) Her name was derived from the fact of her feet being turned outward, and thus resembling the letter lambda (),Etymologicum Magnum p. 199. Compare Cypselus. (cited in Smith) which, by the accounts of the most ancient Greek grammarians, was originally pronounced labda .
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References
"Labda." Leonhard Schmitz. Dictionary of Greek and Roman Biography and Mythology. William Smith, editor (1870).