Argus Panoptes 
 
Argus Panoptes was a watchman with a hundred eyes.

Hera had set Argus to watching Io, who had been transformed into a cow. Hera wanted to keep Zeus away from Io. With a hundred eyes watching Io, Zeus had no hope of spiriting Io away without detection from Argus. Even when Argus slept, some of his eyes would continue to watch, while the rest of the eyes were closed.

Zeus decided to send his resourceful son, Hermes. Hermes was dressed as a shepherd. Hermes lulled Argus to sleep, before the god killed the watchman with his sword.

Hera rewarded Argus for his service, by placing his eyes on the tail of the peacock, which was her favourite bird.

Argus Panoptes had been credited for killing the monster Echidna.