Norway revolted against the Danish King for wanting to introduce Protestantism. After Sweden left the Kalmar union, Norway and Denmark were to be independent states sharing the same king, but this did not go well. In 1536, Norway ceased being its own kingdom and came under Danish rule.

1. Norway makes a revolt against the Danish King,
because he wants to introduce Protistantism.
After Sweden broke with the Kalmar union, it was
decided that Norway and Danmark should be two
indepented states, but with the same king. That did
not go so well, and in 1536 it was decided that
Norway, cease as an own kingdom, but under Danish
rule.