The castle erected as the seat of territorial authority and the order knights, which constituted its crew. A typical teutonic conventual castle was put on a square-like plan with four wings of the same or similar height, that surrounded the courtyard with cloisters. The largest rooms: the castle’s church, refectory, chapter house and dormitory were located on the main floor, which was usually the first floor. They were always available from the cloisters. The main castle was crowned with corner towers and often with bergfried tower, and the whole was surrounded by an outer wall running parallel to the walls of the convent’s house. Economic rooms and warehouses were located in rooms on the ground floor or attic, or on the territory of one or several outer baileys. Examples of conventual castles are strongholds in Gniew, Malbork and Lidzbark Warmiński (although it was a bishop’s castle).