[mythology] In Greek mythology, Pirene or Peirene (Πειρήνη), a nymph, was either the daughter of the river god Asopus, Laconian king Oebalus, or the River God Achelous, depending on different sources. By Poseidon she became the mother of Lecheas and Cenchrias. When Cenchrias was unintentionally killed by Artemis, Pirene`s grief was s...