The ransom of a player character is ten percent of the GDP of that players current holdings, or ten percent of the GDP of the players holdings at the start of the game, whichever is larger. Normally, you can always ransom yourself if captured. However, if you are excommunicated AND outlawed, you cannot ransom yourself if captured in battle or seized . When you examine a PC their ransom will show. When you capture someone a minimum ransom will be calculated. This minimum ransom is based on the starting GDP of that position.