Magistrates – +1 influence for ruler clan +1 security for towns town taxes reduced by 5%.Castle Charters – castles give +1 influence castle upgrades reduced by 20%.Royal Guard – ruler clan gains +1 influence and +80 ruler’s party size non-ruler clans lose 0.2 influence.
These are the following kingdom policies that increase your influence gains (per day) in Mount & Blade II: Bannerlord: Refer to the list below to see what other kingdom policies can be gained as well:
You should grab Council of the Commons first followed by Feudal Inheritance to get a nice bonus of 40 or so Influence. After this, focus on the policies that can be implemented at the kingdom level to increase the amount of Influence and militia growth you can gain in the game. The Forum is the first upgrade that should go in all of your towns and villages to increase the amount of Influence you generate.