The Indo-European tripartition of society into the religious class, the warring class, and the working class is pretty much specific to Indo Europeans. And a deep organisation of classes : see Indian casts, Celtic druids, warriors and the rest, Plato's Republic, the monarchic system in France with nobles, religious authorities, and the tiers état, or today with politicians, CEOs and wage slaves (last interpretation still subject to ongoing anthropological research and a copious amount of snark)

Un roi sans divertissement est un homme plein de misères