Rhodius Apollonius, The Argonautica
“ And on their left hand they had lofty Caucasus and the Cytaean city of Aea, and on the other side the plain of Ares and the sacred grove of that god, where the serpent was keeping watch and ward over the fleece as it hung on the leafy branches of an oak. And Aeson’s son himself from a golden goblet poured into the river libations of honey and pure wine to Earth and to the gods of the country, and to the souls of dead heroes; and he besought them of their grace to give kindly aid, and to welcome their ship’s hawsers with favourable omen. ”
