Argus

Argus, the son of Zeus and Niobe, third king of Argos, which took from him its name.—ARGUS, son of Agenor, or of Inachus, surnamed Panoptes ('all-seeing'), had one hundred eyes, some of which were always awake. Hence Hera appointed him to watch over the cow into which Io had been transformed. Hermes being commissioned by Zeus to carry off the cow, slew Argus by stoning him; or, as Ovid says, first charmed him to sleep by playing on the flute, and then cut off his head. Hera put his hundred eyes in the tail of the peacock, her favourite bird.—ARGUS, the builder of the ship Argo (see ARGONAUTS).