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Contents 1 Overview 2 Diplomatic Relations 3 Diplomatic Actions 4 Peace Negotiation 4.1 Annex 4.2 Demand Tribute 4.3 Offer White Peace 4.4 Offer Tribute 5 See Also

Overview

Diplomacy is any sort of interaction between states in Europa Universalis III that does not directly involve the military. It includes creating various kinds of treaties and alliances with friends and enemies, as well as peace negotiations which conclude wars.

Diplomatic Relations

The diplomatic relations between two countries are measured on a scale from -200 (worst) to +200 (best). Relations can be raised by acts such as sending gifts or accepting royal marriages, but can also be lowered by sending insults or declaring war. Relations dictate the likelihood that a nation will accept your diplomatic proposals, good relations making it more likely.

Diplomatic Actions

• See also: Casus belli

All diplomatic actions require 1 diplomat. Actions and details unique to Heir to the Throne are marked with a .

Diplomatic Action	Prerequisites	Effects
Declare War	None	Begins a war
Sue for Peace	War	Negotiation menu
Royal Marriage	Both parties must be monarchies, same religion group	Royal marriages allow for personal unions and the spread of dynasties
Offer Alliance	None	Alliance created with target
Dissolve this Alliance	Both alliance members must be at peace	Alliance is dissolved, relations suffer
Issue Embargo	None	Bans target's merchants from local COT and cuts trade revenue in their COTs from issuer's provinces
Revoke Embargo	Have an embargo	Revokes embargo
Offer Trade Agreement	None (Unavailable to Merchant Republics )	Your merchants no longer compete with the target's at any COTs, -2% Trade Efficiency
Cancel Trade Agreement	Have a trade agreement with target	Cancels agreement
Offer Vassalization	Royal marriage, military alliance, relations ≥ 190, same religion, and target at peace	Target becomes a vassal, you get 50% of their income
Demand Annexation (Commonly called diplo-annexing)	Target must have been a vassal for 10 years, you did not annex another vassal for 10 years, relations ≥ 190	Vassal is incorporated into your nation, +1 move to Decentralization
Proclaim Guarantee	None	Get called to arms against anyone who attacks the target
Send Warning	None	Get CB on target if they declare war on anybody (on your neighbors )
Ask for/Cancel Military Access	None	Establishes/Cancels military access, which allows you access to foreign provinces and support limits.
Give/Revoke Military Access	None	Gives/Revokes military access from target
Send Gift	Enough ducats	Increases relations with target. Cost is proportional to target's wealth
Send Insult	None	Lowers relations with target, gives them CB. This is the only way to end personal union as junior partner (relations must be ≤100).
Claim Throne	Royal Marriage	Gain CB on target, drastically reduces relations
Loan Offer	Enough ducats	Loan menu: allows you to set loan size, interest rate, and repayment schedule in months
War Subsidies	Enough ducats (but no war)	Transfers portion of your monthly income to target. In Heir to the Throne, AI will subsidize you if you fight a common enemy.
Sell Province	≥ 1 province	Sell province menu: allows you to set a price in 20 ducat increments. Cores are worth more, inaccessible provinces are rejected.
Excommunication	Papal controller, target is Catholic and has under 100 relations with Papal State	All Catholics gain Excommunication CB on target
Declare Crusade	Papal controller, non-Catholic target	All Catholics get Holy War CB on target, plus advantages should they declare war.
Invite to Trade League	Must be Merchant Republic	Targets provinces all generally trade from republic's COT
Ask for Trade Rights	Must be Merchant Republic	Provinces producing agreed upon trade good will trade from republic's COT
Expand Influence	High Prestige	Sphere of Influence is extended over the target

Peace Negotiation

If you wish to end a war, there are four basic ways to negotiate peace. Negotiations with an alliance leader will end the war with all members of the enemy alliance. Signing a peace treaty always results in a 5 year truce with all nations involved. The consequence for breaking a truce is -5 stability.

Annex

You may only annex a nation if it has been reduced to 1 province: its capital. The only two exceptions are:

• Pagan countries, which may be annexed at any size for a flat infamy cost
• Revolter nations, resulting from successful nationalist rebels, can be defeated and reabsorbed in their entirety.

Demand Tribute

This option brings up the demand tribute window. There you may make multiple demands such as indemnities or forced vassalization.

Offer White Peace

White peace is another term for status quo ante bellum (Latin for the situation as before the war). Nothing is surrendered. Nevertheless, it is considered a marginal loss for the attacker, since they fail to achieve their goals.

Offer Tribute

Similar to demanding tribute, except when you offer tribute you must cede some possessions to the enemy.

See Also

• Badboy and Infamy
• Personal union
• Sphere of influence