Io.

Io (Ἰώ) was a character in Greek myths and legends.

She was Zeus' lover. Then he turned Io into a cow.

Argus Panoptes guarded Io.

She met with other gods and goddesses.

Argus Panoptes.

Argus (Argos) Panoptes (Ἄργος Πανόπτης) (Argus) was a many-eyed giant in Greek mythology. Also, he was known as "All-seeing Argos".

Arestor (Ἀρέστωρ) was the father of Argus.

Some of his eyes were asleep and some were open, so Argus could be a guard.

He was the guardian of Io (Ἰώ). Hera asked Argus about this.

Argus was killed by Hermes. Then Hera placed his eyes on the peacock's tail.