Gdańsk

Gdańsk was first mentioned in 997 as part of the Duchy of Poland, and thereafter grew into a trading town under the Piast and Samboride dynasties. Shifting between Polish and Teutonic control during the Middle Ages, it subsequently joined the Hanseatic League and, with considerable autonomy, served as the Polish Crown's principal seaport and largest city until the early 18th century. With the Partitions of Poland, the city was annexed by Prussia in 1793, and was integrated into the German Empire in 1871. It was a free city from 1807 to 1814 and from 1920 to 1939. On 1 September 1939, it was the site of a military clash at Westerplatte, one of the first events of World War II. The contemporary city was shaped by extensive border changes, the flight and expulsion of the German population and Polish resettlement after 1945.