Better public order, Ai will attack nearby war regions more, Mongols will demand vassalage more.

Mongols will vassal less sack and raze a bit more and occupy more.

AI will spend more on armies, construction, tech research, less on agents and diplomacy.

Better trade income for sea trading.

Better regional defense.

City Walls and Forts made stronger ,

Better chances of ambushes in deserts and forests and hills.

Better balanced armies.

Complete overhaul of Religious and Regional Cultural Relations. Will see more religious conflicts and cultural hatreds resulting in more interesting diplomatic standings and will be tougher to get treaties. I a factions hates your faction-most likely they will just give you the finger. You will see more infighting between various Christian Factions. Muslim factions get a a starting money boost to help them survive.

Diplomacy: Allies value allies more keep treaties better support allies in battle better.