Ancaeus

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.