<P> In Classical antiquity, Philosophy was traditionally divided into three major branches: </P> <Ul> <Li> Natural philosophy ("physics") was the study of the physical world (physis, lit: nature); </Li> <Li> Moral philosophy ("ethics") was the study of goodness, right and wrong, beauty, justice and virtue (ethos, lit: custom); </Li> <Li> Metaphysical philosophy ("logos") was the study of existence, causation, God, logic, forms and other abstract objects ("meta - physika" lit: "what comes after physics"). </Li> </Ul> <Li> Natural philosophy ("physics") was the study of the physical world (physis, lit: nature); </Li> <Li> Moral philosophy ("ethics") was the study of goodness, right and wrong, beauty, justice and virtue (ethos, lit: custom); </Li>

Who is credited with the development of the earliest known moral philoshy