Diplomatic annexation

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This article is accurate for the latest versions of EU3, Napoleon’s Ambition, In Nomine, Heir to the Throne and Divine Wind.

Diplomatic annexation (aka DA, diplo-annex, diplo-annexation) is a diplomatic option that you may perform on a vassal. If they accept, they are annexed and become part of your nation. See the Diplo-Annexing Strategy guide for tips and suggestions.


This option requires:

  • Vassal for at least 10 years
  • 190 or better relations
  • Same religion group
  • Both nations at peace

Likelihood of Success

The following factors increase the likelihood of a successful diplo-annex:

  • High monarch's diplomatic skill
  • High target's diplomatic skill
  • High Prestige
  • Good Reputation
  • Long vassalization (cap of 30 years)
  • Trust level of the vassal


  • Lower Reputation penalty for annexation (just 1 BB per province).
  • No need to engage in warfare.


See also