Note: The following text is from the 1911 Encyclopedia Britannica.
ANCAEUS, in Greek legend, son of Zeus or Poseidon, king of
the Leleges of Samos. In the Argonautic expedition, after
the death of Tiphys, helmsman of the ``Argo,'' he took his
place. It is said that, while planting a vineyard, he was
told by a soothsayer that he would never drink of its wine.
As soon as the grapes were ripe, he squeezed the juice into a
cup, and, raising it to his lips, mocked the seer, who retorted
with the words, Polla metaxu pelei kulikos kai cheileos
akrou (``there is many a slip between the cup and the
lip''). At that moment it was announced that a wild boar
was ravaging the land. Ancaeus set down the cup, leaving
the wine untasted, hurried out, and was killed by the boar.
Apollonius Rhodius, i. 188 (and Scholiast), ii. 867-900.