There would be a number of GM-designed game kingdoms. Characters could join one kingdom, subject to the approval of the kingdom's leader.
Some kingdoms grant the right to own land.
Members of these kingdoms may claim ownership of a province by attacking any existing garrison and installing their own. The character who actually installs the garrison becomes the direct owner. The owner may add or remove soldiers from the garrison. The garrison may not execute any commands. The kingdom leader receives a short summary of the provinces claimed by the kingdom, and their direct owner.