Hermes’s epithet Argeïphontes (Ancient Greek: Ἀργειφόντης; Latin: Argicida), meaning “slayer of Argus”,[75][76] 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’s eyes with the caduceus to cause the giant to sleep, after which he slew the giant with a harpe.[14]
checks WP
https://en.wikipedia.org/wiki/Hermes
Hermes’s epithet Argeïphontes (Ancient Greek: Ἀργειφόντης; Latin: Argicida), meaning “slayer of Argus”,[75][76] 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’s eyes with the caduceus to cause the giant to sleep, after which he slew the giant with a harpe.[14]