We're not talking about said "before" here, we're talking about a fictional world with no connection to real life. Some aspects of it certainly resemble certain aspects of real life, but in no way will it always be representative of real world history at any given time, especially since it doesn't take influence from only one time or culture. Now you're welcome to present evidence from any Elder Scrolls game that Tamriel, more specifically, Skyrim, in this case, since that's where the game is set, has a caste system, if you can find any.
I'm well aware the Elder Scrolls is a High Fantasy game, if you would've read my post completely you would've seen that I was responding to a fellow forum member on their views on real life and classes.
But there's no way you can tell me Imperial Culture is not in some way shape or form representation of Roman influence.
Same goes with the Nords and their seemingly Viking style demeanor.
As a matter of fact, if you check out the Art Video on GI you can see a Viking book right next to the concept artist which gives visual evidence that they're basing Skyrim on the real life designs of the past "Nordic" civilization -- whether it's being used architecturally, or for character modeling and weapon design.
Also, in Morrowind, which is in Tamriel, there is a refined caste system separating Dunmeri Nobles and commoners. I think that's evidence enough.
And Mazoga the Orc is a fine example in a Oblivion of the caste system in play.
The orc claiming she was a knight was proposterous. Until the king made her one.
Walk into any castle in Oblivion and witness the Caste system.