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Go to C:\Program Files\Paradox Interactive\Europa Universalis - Rome\common and open static_modifiers.txt with Notepad. Use ctrl+F to find base_values and add a line saying pirate_spawn_chance = -1000. I think that should work.
 
Thanks, I tried it out and they still spawn very quickly. Maybe I wrote the line in the wrong section, this is how it looks like right now:

# Global Static Modifiers
##########################################################################

base_values = {
pirate_spawn_chance = -1000
omen_power = 1.0 #1.0 is base.
omen_chance = 0.30 #30% chance as base.
experience_decay = 0.03 #3% of current.
land_organisation = 0.2 #20% morale recovery.
naval_organisation = 0.2 #20% morale recovery.
max_friends = 2
max_rivals = 2
tribute_income_modifier = 0.5 #Base tribute modifier, 50%
badboy = -0.5 #reduce by about 0.5 each year
tyranny = -0.25 #reduce by about 0.25 each year
}
 
In the same vein of questioning would it be possible to change the number of pirates that can spawn, and perhaps give them leaders like the barb have?

As for your question, maybe there is something else that influences pirate spawn odds. I'll keep looking.
 
I think someone managed it by just removing PIR from the countries.txt file. But someone more acquainted with the Rome system should know for sure :)
 
Personally, I don't think it looks ridiculous. It extends your ability to see troop movements by two provinces, it eliminates random pirate spawns, and it only costs 10 per coastal province.
 
You don't have the law that increases pirate spawn chance, right? It's called Lex mercis libero, and I guess it will have an effect on your game even if your neighbours pass it. If I were you, I'd remove the line saying pirate_spawn_chance = 0.1.