Defender of the Crown puts you in the role of one of four Saxon knights in medieval England, in a time where the land is in turmoil as the King is dead and his crown was stolen. The Saxons and the Normans blame each other and fight for control of England.
After a short introduction by Robin of Locksley himself, you start the game with a single castle and 10 soldiers at your command. From there, you have to build your army, take control of additional territories and fight the three Norman lords - and sometimes your Saxon friends as well.
The game has several different styles: You may either engage in a jousting contest where you have to knock your opponent off his horse using a lance, you can go raid a castle for loot or you can attack another territory/castle.