Every organization must have a management structure, and that is true of the Hann Empire. While it is called an Empire, it doesn't have an Emperor to rule it, nor are there rules about how every single state and nation will be run. However, broad policy and minimum standard are set by the Empire Council, although its most important function is to manage trade agreements and mutual defence. It has two major tools to help with that, The Raven King of Arms and the Lex Gasgana.

The Empire Council - Members, Power Blocks and Politics

Noble Titles - as recognized by the Raven King of Arms.

lex_gasgana - the legal framework, used or recommended, throughout the empire.

The Military - While individual states have their own military forces, the Empire troops provide the glue that holds them all together.