HERE IS WHAT YOU DO.

First, build a peasant unit and an inquisitor.

use the inquisitor to burn (Thats what I call a Trial - conviction - execution of a general) the peasant general per turn for a while.

Eventually, you have what I call a King Killer with all the valour you will get from killing Peasants.

Start Buring Kings, Princes, Popes, Hitlers, whatever until mass rebellions due to no king.

Also good for killing popes.

Best thing of all, if you fail, your Inquitor doesn't die.