The Euphemus reference article from the English Wikipedia on 24-Apr-2004
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Euphemus

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In Greek mythology, Euphemus was the son of Europa and Poseidon. Medea prophesied that he would one day rule Libya when she was on the Argos with Jason and the Argonauts; Euphemus was the helmsman. Her prophesy came true when Battus, a descendant of Euphemus, founded Cyrene, the capital of Libya.