Sim Vassal is a medieval RTS based in the times of the Inquisition. You are a vassal, an owner of land given to you by a higher noble. Because of scientists' questionable work being sponsored by your lord, the inquisition has reason to find you deserving of death. Fend off their and other's attacks and you may survive to live the happy life of a vassal.
Don't be thrown into thinking you have no control by the different resource system. Instead of gathering metals or wood, you can employ 'serfs' to work on your land. At the end of the year each serf pays 50 gold in taxes and your fields are harvested giving you a certain amount of gold.
Pay attention to the instructions given to you in the first year as they will help you progress faster and stay alive longer. Upon winning you will recieve a code; use it in the game as many times as you want and you'll have a nice army of ninjas.