clairvoyant person,troublesome guard

To the giant in Greek mythology. The supreme goddess Hera had him keep watch with princess Io, with whom the supreme god Zeus committed adultery. Zeus had turned her into a cow so that she would be hidden from his wife. Hera nevertheless found out and appointed Argus as guard.

Argus had a hundred eyes, never all asleep at once. Under the influence of Hermes' flute playing, he dozed off anyway. Hermes stabbed him and beheaded him. Hera had all his eyes transferred to the tail of a peacock, her favorite bird.

Rubens painted the metamorphosis of Argus into a peacock. Also 'with suspicion': with suspicion.