Gotland

Gotland is an island off the eastern coast of Sweden proper.

History
The island has always had a Swedish population, but when it was pawned by the Teutonic Order to Denmark in 1409, it was placed under the direct control of the Danish crown.

During the Swedish War for Independence, the island was occupied by former King of Denmark Eric I, and Danish troops could not lift the siege. As such it was the only province taken (or rather, returned) by Sweden in the Treaty of Stockholm.

On 12 September 1450, since the fortress on the island was not being used, it was demolished. On 26 September 1459, in exchange for diplomatic support, the island was given to the burghers.