In 1398, this island was invaded by Konrad von Jungingen, then the leader of the Teutonic Knights.
In 1398, this island was invaded by Konrad von Jungingen, then the leader of the Teutonic Knights. This island was once the headquarters of a group led by Klaus Stortebeker. Apart from being home to the Likedeelers and the Victual Brothers, this island's main port was the subject of the Treaty of (*) Stralsund, an agreement between Valdemar IV of Denmark and the Hanseatic Leaugue that gave control of this island to the latter. This island's capital is Visby, and it has its own language in the North Germanic family and is today part of Sweden. For ten points, name this largest island in the Baltic Sea.
In 1398, this island was invaded by Konrad von Jungingen, then the leader of the Teutonic Knights.
{Gotland}