Keep in mind if the duchy has a non-coastal capital it will become a regular republic IIRC, so make sure the duchy capital is on the coast! Mallorca, Sardinia, Krete and Cyprus are all great duchies in vanilla ck2 to turn into vassal Merchant Republics due to their small size. This means Patricians have spawned, and those are what makes you $$$ via trade posts. The moment you do #3 correctly, you should get spammed with 'A new great house has arisen in county name, politics blah blah' 4 times or so. (The city will become the county's capital, demoting the castle to a minor barony.)ģ) Grant any duchy title to the lord mayor. Grant the city title to a courtier (or any mayor in your realm).Ģ) Grant the county title to the mayor. after a holy war, you can create a vassal republic in three steps: If you personally hold both a coastal county and a city in that county, e.g.
How to create a vassal (merchant) republic, shamelessly ripped from the ck2 wiki:
