Explore the intricate Faction System: Join a faction to put pressure on your liege, and keep track of factions in your own realm.

Raise standing armies: You will now be able to use retinues to have standing armies in your domain: the size is determined by technology.

Experience Factional Revolts: No more easily defeated rebellions. Disgruntled vassals will now band together in revolt against your rule through their faction.

Appoint Orthodox patriarchs: Orthodox kingdoms and empires can now control their own heads of religion and their powers, instead of being dependent on the patriarch of Constantinople.

Streamlined mobilization: You will always raise a single, larger levy from your direct vassals; no need to worry about the opinions of the lower vassals.

Leader Focus on Combat: Appoint your generals wisely, their traits& skills are now of vital importance on the field of battle. More commander traits are now added to increase the importance of your choice of military leaders.

Explore Byzantine Events &Decisions: Legacy of Rome includes many specific events & decisions to make the Byzantine Empire come alive.

Improve your ruler: You can now actively strive to improve your skills or traits through the new Self Improvement Ambitions.