Nemesis

In Greek mythology, Nemesis (Greek, Νέμεσις), also called Rhamnousia/Rhamnusia ("the goddess of Rhamnous") at her sanctuary at Rhamnous, north ofMarathon, was the spirit of divine retribution against those who succumb to hubris (arrogance before the gods). Another name was Adrasteia, meaning "the inescapable." The Greeks personified vengeful fate as a remorseless goddess: the goddess of revenge. The name Nemesis is related to the Greek word νέμειν [némein], meaning "to give what is due"

Source: http://en.wikipedia.org/wiki/Nemesis_(mythology)