Techniki budowy zamków w ziemi chełmińskiej. Nowe dane w świetle badań archeologiczno­‑architektonicznych z lat 2016–2018

In the years 2016–2018, as part of the research project “Castra terrae culmensis – na rubieży chrześcijańskiego świata”, five castles at the Chełmno land were studied. They supplemented the existing knowledge concerning construction techniques. Castles in Starogród and Bierzgłowo represent the oldest period of brick construction in Prussia. They constituted a continuation of wood and earth fortifications. When building the walls, the older embankments were completely removed (Starogród) or lowered (Bierzgłowo). The curtains were set in narrow ditches, at different levels. The castle in Lipienek represents a type of castle, which was built around 1280. However, it was located in the place of a gord, which deviates from the rule when it comes to this type of castles. However, here the builders took advantage of designing methods, construction staging, and large embankment works typical for such type of castles. However, the presence of a rampart forced a modification of the standard technique. It was necessary to partially level it in order to be able to build the basement walls individually. The presence of earthworks – embankments, was also found in the fore court II in Papowo Biskupie. They were also characteristic for irregular castle zwingers erected during this period (Starogród, Bierzgłowo). Whereas, in Unisław it is possible to trace the technique of building an arcade foundation.