Historical advisors
From EU3 Wiki
When you start a new game, there will be a number of historical advisors, or Great Men to hire to your court. Some may be selected to your court already, and others may be available for hire.
Up to 3 advisors may be hired at one time. Advisors cost a one-time fee to recruit, and then a monthly upkeep. The magnitude of his bonus and his upkeep cost is dependent on his skill level, represented by stars in-game.
It is adviseable to check for good advisors at the very beginnign of the game, before you unpause. A great advisor can contribute a lot to your country's development.
Modding historical advisors
The historical advisors are located in .txt files in the history\advisors\ folder. There are files for various regions of the world here. If you want to add your own, you can change an existing file, or you can just add your own. All files in this folder are read at startup.
An advisor definition looks like this:
advisor = {
name = "John Fortescue" #English lawyer
location = 234 #Wessex
skill = 1
type = statesman
date = 1424.1.1 #30 years old
death_date = 1476.1.1 #died
}
Here, location defines the home province of the advisor. The owner of this province may get him pre-selected, as mentioned above. The skill defines the bonus and cost of hiring him; type defines what kind of bonuses he gives while date and deathdate defines the time intervall where he will appear as a historical advisor at startup.
In this case, John Fortescue will be availabel as a level 1 statesman if you start before 1. Jan. 1476.

