Königsberg became a Polish fief for 201 years.

An excerpt from the article 24 facts about Kaliningrad

After the Grand Master paid tribute to King Sigismund I the Old on the Krakow Market Square in 1525, Königsberg became the capital of the Duchy of Prussia, dependent on the king as a fief. As a sign of dependence, the black Prussian eagle received a royal crown around its neck and the letter "S" from the Latin form of King Sigismund's name - Sigismundus.