Nereus

So, when the tempest bursting wakes the war, / the justling winds in conflict rave and roar, / South, West and East upon his orient car, / the lashed woods howl, and with his trident hoar / Nereus in foam upheaves the watery floor.

Like all water-spirits, Nereus possessed the gift of prophecy, though he did not always choose to make use of it.