In January 1255 a powerful invading army of crusaders under the command of King Ottokar II from Bohemia crossed the icebound gulf Frishes Huff and pillaged the settlements of Zemland. On their way back the knights captured and destroyed a free settlement of Prussians called Twangste ('wangus1 is a Prussian word meaning 'oak-wood') located not far from the river Pregel's mouth. On its site the crusaders founded their fortress which was named Kenigsberg, Most probably after King
Ottokar.
In September 1255 a wooden fortification was already built, but the rebellious Prussians burnt it down. By 1257 the first stone building was erected inside the. fortress and the construction of other brick buildings began. They divided Lobe-Beich brook with the dam making two ponds — Schloss-Teich (Castle Pond) and Ober-Teich (Upper Pond), and filled the moats with water. Later the fortress and the Castle itself were often renovated and expanded.
The Castle