The kingdom, or realm, is a large and diverse place, both geographically and culturally. In ages past it was broken up into literally dozens of tiny kingdoms, tribes, clans, and nations. That all changed when King Hostar, called Hostar the Unifier, united them under his banner and founded the Kingdom of Ashewold.
That was centuries ago, and Hostar's decendants still rule from the great castle and city he built on the edge of the world, the City of Night, or Ravensreach. The former kingdoms of the realm are now minor fifedoms under the rule and law of the King.
Minor disputes still occur over trade, slaves, raids, farming rights and myriad other trivialties. Sometimes households are wiped out, and new lords create their own houses, raising new castles.