>offensive
Seiges win wars, this is by far the best military idea
>aristocrac
Good if your stacking combat ability
>espionage
siege ability, really shines playing someone who doesn't get claims through mission trees
>innovative
+1 leader siege with offensive and 15% combat ability with quality
>humanist
If your playing sunni and don't want rebels
>religious
If your playing Shia or Orthodox
>trade
The best moneymaking idea group

>>2106539
Really in single player take whatever you want it doesn't even matter