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A sense of the difference between right and wrong and a corresponding recognition of a concept of morality can be widely, maybe even universally, attested, as has been suggested for the Golden Rule (treat others as you would have them treat you). But how far does the great variety of explicit codified legal systems that can be attested across the world and over time undermine any possibility of treating law or even ‘custom’ as a robust cross-cultural category? This chapter investigates the similarities and differences in those systems in ancient societies (Greece, China) and in modern ones (e.g. Papua New Guinea) to throw light on the one hand on the importance of law for social order but on the other on the difficulties facing any programme to secure lasting justice.