Argus Panoptes was the ultimate sentinel. He had a hundred eyes. Can you imagine how many cataract operations he would have needed, had he lived into old age. Unfortunately for him, he was set to guard Io by the goddess Hera, but Hermes killed him and stole Io.
In his memory, Hera took his eyes, and put them on the tail of her bird, the peacock.
It seems a shame that his name is remembered nowadays as a shop.
Mind you, it's still better than what happened to Ajax.