Re-create a Kingdom / Republic
Prussia (Kingdom)
Finland (Kingdom)
Livonian Confederation (Republic)
Kurland (Monarchial version of Livonian Confederation)
Novgorod (Republic)
Kyviv Rus (Kingdom; as opposed to the Republican Cossacks)
Polotsk (Belarus Republic)
List over
Imagine a modification (or an expansion) which allows the player a degree of free-form (similiar to Warband) to create their own Kingdom and Republic; albeit within historical limit (i.e. no 'Smurf Kingdom of Greater Mazowia').
No pretenders but you have to search for a 'historian' in a Tavern and assert claim over this Kingdom and seize a castle in that region's historical territory.
Once doing so, NPCs claiming descendence from the nobles / plutocrats of these former states will offer their service to you.
1. Find Historian
2. Learn about the 'historical' Kingdom or Republic
3. Tell the historian 'I wish to claim succession and/or become pretender of XXX'
4. Capture castle / city of that former state.
5. Establish Kingdom and Republic
6. 20 Nobles / Plutocrats; claiming to be disposessed descendence of former statesmen of those former kingdoms / republics, will pledge their allegiance to you.