A universe by Lois McMaster Bujold that is similar to Middle Ages-like Spanish/Italian/French real world. The major differences from real world are:
1. Geography
2. Religions - one has 4 gods, another has 5 (same 4 plus 1)
3. Gods are real and participate in the world.
4. People and events.

Almost everything else (society structure, relationships between social classes, etc) is pretty realistic.