Become a real medieval feudal lord: start with a small village and build it up into an enormous impenetrable castle. You will have to repel enemy raids: hide behind thick walls, lure your enemies into strategically placed traps, and even lead your loyal peasants into battle.
You start the game with a few peasants and limited resources that you will use to eventually turn your small settlement into a real medieval castle. Build, mine resources, grow crops, manufacture equipment, trade, and advance science on your own or by delegating tasks to your people. Greedy bandits will regularly raid your settlement, so you'll have to rally militia troops and repel the enemy.