Argus Panoptes
Hermes' epithet "Argeïphontes" (; ), meaning "slayer of Argus", recalls the slaying of the hundred-eyed giant Argus Panoptes by the messenger god. Argus was watching over the heifer-nymph Io in the sanctuary of Queen Hera, herself in Argos. Hermes placed a charm on Argus' eyes with the caduceus to cause the giant to sleep, after which he slew the giant. The eyes were then put into the tail of the peacock, a symbol of the goddess Hera.