I'm mostly asking about Europe, but this could be asked about many other parts of the world as well. Basically what I'm asking is how did the Nobles become the Nobles and the Peasants become the Peasants? Is it simply a mystery? Hope my question isn't too vague.
hi! you can get started on this section of the FAQ*. The threads focus more on monarchs than aristocracy in general, but hopefully someone will chip in with more info for you.
*see the link on the sidebar or the wiki tab