Gotland, the Jewel of the Baltic

Valdemar II

Banned
How do we get a independet Gotland? Bonus points If the Gotland state includes one or all of Ösel, Dagö or the Åland Islands. I would like as late POD as possible, and dominans of either Swedish or Gutnish as a independent language.
 
maybe the Victual Brothers remain strong, they conquered Gotland in around 1394. So a sort of (Christian) Pirate Republic on the island would survive, controlling much of the Baltic shipping and getting very rich from it.
 
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