Mercury and Argus

According to the myth, Argus was a prince from the Peloponnesian city of Argos who had one hundred eyes. Since fifty of them were open at any given moment, Juno ordered him to stand guard over the young Io, who had been seduced by Jupiter and then changed into a cow. Mercury, sent by Jupiter, lulled Argus to sleep with the sound of his flute, and then he cut off Argus' head (or stoned him to death). Juno scattered the eyes of the slain Argus on the tail of a peacock, after which the bird was devoted to the goddess.