Originally, in the place of present-day Kaliningrad, there was a Prussian settlement, which until the 13th century was called Twangeste ("Oak Forest").

An excerpt from the article 24 facts about Kaliningrad

In 1231, the Teutonic Order began the conquest of these lands and in 1255 Twangeste was destroyed and replaced with a new fortress, a military fortress called Königsberg (Regiomontium - royal mountain) in honor of the most outstanding military commander, King Ottokar II of Bohemia. The Order built a castle on the Pregoła river - the history of the town of Königsberg lasted about 700 years.

In 1312, the castle became the residence of the Grand Marshal of the Order.

The Old Prussian culture finally died out in the early 18th century with the great plague, and the surviving Prussians assimilated.