From the back cover:
Empires is a complete guide on founding, growing and running your own empire. Whether you are a single knight responsible for a border keep and a village or part of a huge dynasty in command of a continent sprawling empire. Empires contains everything you need to know about taming the wilderness, building castles, governing populations, and trading or waging war with your neighbours. Leave your own mark on the game world by building an impregnable society.
Updating the original Runequest Empires supplement and adding a great deal of new information on running your own dynasty. Empires features everything you need to create and master your own dominion.