Nemesis

In late Greek mythology, the goddess of retribution, who especially punished hubris (Greek hybris), violent acts carried through in defiance of the gods and human custom.

Nemesis was originally a goddess of distribution, concerned with preserving order and proportion in the affairs of men. She personified the indignation felt at the unjustified or excessive prosperity in others, and became the agency which restored the natural balance, as in the legend of Polycrates of Samos who met an untimely death after Amasis, king of Egypt, abandoned his alliance with Samos because of Polycrate's success.

In one story she was pursued by Zeus, father of the gods, and changed herself into various forms, principally fish and birds. Finally she laid an egg, which a shepherd gave to Leda, traditionally mother of Helen and the brothers Castor and Pollux (Greek Polydeuces).