Statistics for occurrence #1 of “Olen” in book 10, chapter 5, section 7 of Pausanias, Description of Greece:
...rophetess of the god, and first sang in hexameter verse. Boeo, a native woman who composed a hymn for the Delphians, said that the oracle was established for the god by comers from the Hyperboreans, Olen and others, and that he was the first to prophesy and the first to chant the hexameter oracles.
...