Regent Deluxe

From mobygames.com:
 

In 1109 the last landgrave who is loyal to the emperor is murdered. It's anarchy in the Holy Roman Empire! Obviously you are playing as one landgrave who wants to become the most important man.
 

Similar to the German classic Kaiser, you issue commands like attacking, producing food or weapons and building castles in many different and complicated menus. The outcomes of combats are calculated by the computer, the game itself is completely turn-based.