from Hades. [ edit ] Theocritus The  Sicilian  Greek poet  Theocritus  wrote two poems circa  275 BC  concerning Polyphemus' desire for  Galatea , a sea  nymph . When Galatea instead married  Acis , a Sicilian mortal, a jealous Polyphemus killed him with a boulder. Galatea turned Acis' blood into a river